Remove torchaudio remnants from code

Remove torchaudio remnants from code.

Follow-up on:
- #5573

Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_6922). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

<details>
<summary>Show benchmarks</summary>

PyArrow==8.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.005525 / 0.011353 (-0.005828) | 0.004013 / 0.011008 (-0.006996) | 0.063931 / 0.038508 (0.025423) | 0.033857 / 0.023109 (0.010748) | 0.250910 / 0.275898 (-0.024988) | 0.278289 / 0.323480 (-0.045191) | 0.004289 / 0.007986 (-0.003697) | 0.002800 / 0.004328 (-0.001529) | 0.050127 / 0.004250 (0.045877) | 0.048901 / 0.037052 (0.011848) | 0.260628 / 0.258489 (0.002139) | 0.293904 / 0.293841 (0.000063) | 0.028339 / 0.128546 (-0.100207) | 0.010879 / 0.075646 (-0.064767) | 0.203618 / 0.419271 (-0.215654) | 0.036241 / 0.043533 (-0.007292) | 0.250481 / 0.255139 (-0.004657) | 0.274274 / 0.283200 (-0.008926) | 0.018912 / 0.141683 (-0.122771) | 1.146785 / 1.452155 (-0.305370) | 1.199795 / 1.492716 (-0.292921) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.095571 / 0.018006 (0.077564) | 0.302961 / 0.000490 (0.302471) | 0.000217 / 0.000200 (0.000017) | 0.000109 / 0.000054 (0.000055) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.020121 / 0.037411 (-0.017290) | 0.063231 / 0.014526 (0.048705) | 0.075434 / 0.176557 (-0.101122) | 0.123994 / 0.737135 (-0.613141) | 0.076479 / 0.296338 (-0.219860) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.277816 / 0.215209 (0.062607) | 2.775481 / 2.077655 (0.697826) | 1.454881 / 1.504120 (-0.049239) | 1.339055 / 1.541195 (-0.202140) | 1.347810 / 1.468490 (-0.120681) | 0.572802 / 4.584777 (-4.011975) | 2.357490 / 3.745712 (-1.388222) | 2.822548 / 5.269862 (-2.447313) | 1.746538 / 4.565676 (-2.819138) | 0.066159 / 0.424275 (-0.358116) | 0.005037 / 0.007607 (-0.002570) | 0.329256 / 0.226044 (0.103212) | 3.277511 / 2.268929 (1.008582) | 1.807855 / 55.444624 (-53.636769) | 1.505507 / 6.876477 (-5.370970) | 1.634237 / 2.142072 (-0.507835) | 0.643999 / 4.805227 (-4.161229) | 0.117494 / 6.500664 (-6.383170) | 0.042634 / 0.075469 (-0.032835) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.977689 / 1.841788 (-0.864098) | 12.261836 / 8.074308 (4.187528) | 9.871541 / 10.191392 (-0.319851) | 0.147293 / 0.680424 (-0.533130) | 0.015134 / 0.534201 (-0.519067) | 0.287677 / 0.579283 (-0.291606) | 0.264622 / 0.434364 (-0.169742) | 0.330511 / 0.540337 (-0.209826) | 0.467618 / 1.386936 (-0.919318) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.005690 / 0.011353 (-0.005663) | 0.003801 / 0.011008 (-0.007207) | 0.051817 / 0.038508 (0.013309) | 0.033355 / 0.023109 (0.010246) | 0.264416 / 0.275898 (-0.011482) | 0.288494 / 0.323480 (-0.034986) | 0.004246 / 0.007986 (-0.003740) | 0.002814 / 0.004328 (-0.001515) | 0.050547 / 0.004250 (0.046297) | 0.042977 / 0.037052 (0.005925) | 0.276884 / 0.258489 (0.018395) | 0.303758 / 0.293841 (0.009917) | 0.029412 / 0.128546 (-0.099134) | 0.010697 / 0.075646 (-0.064949) | 0.059497 / 0.419271 (-0.359775) | 0.033670 / 0.043533 (-0.009862) | 0.261311 / 0.255139 (0.006172) | 0.286478 / 0.283200 (0.003278) | 0.019386 / 0.141683 (-0.122297) | 1.155943 / 1.452155 (-0.296211) | 1.198512 / 1.492716 (-0.294205) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.092954 / 0.018006 (0.074948) | 0.294144 / 0.000490 (0.293655) | 0.000213 / 0.000200 (0.000013) | 0.000043 / 0.000054 (-0.000012) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023013 / 0.037411 (-0.014398) | 0.077161 / 0.014526 (0.062635) | 0.089957 / 0.176557 (-0.086600) | 0.129305 / 0.737135 (-0.607831) | 0.091006 / 0.296338 (-0.205333) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.294091 / 0.215209 (0.078882) | 2.885395 / 2.077655 (0.807741) | 1.555658 / 1.504120 (0.051538) | 1.423276 / 1.541195 (-0.117919) | 1.476485 / 1.468490 (0.007995) | 0.569507 / 4.584777 (-4.015270) | 0.979221 / 3.745712 (-2.766491) | 2.818503 / 5.269862 (-2.451358) | 1.871938 / 4.565676 (-2.693739) | 0.064342 / 0.424275 (-0.359933) | 0.005495 / 0.007607 (-0.002112) | 0.351451 / 0.226044 (0.125407) | 3.516078 / 2.268929 (1.247149) | 1.928351 / 55.444624 (-53.516273) | 1.625362 / 6.876477 (-5.251115) | 1.813756 / 2.142072 (-0.328317) | 0.657642 / 4.805227 (-4.147585) | 0.117893 / 6.500664 (-6.382771) | 0.042009 / 0.075469 (-0.033460) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.032893 / 1.841788 (-0.808894) | 12.983400 / 8.074308 (4.909092) | 10.747204 / 10.191392 (0.555812) | 0.133163 / 0.680424 (-0.547261) | 0.015875 / 0.534201 (-0.518326) | 0.312592 / 0.579283 (-0.266691) | 0.124780 / 0.434364 (-0.309584) | 0.350735 / 0.540337 (-0.189603) | 0.447130 / 1.386936 (-0.939806) |

</details>
</details>

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