[Data2Vec] Speed up test
Author: patrickvonplaten
Pull request: yes

# What does this PR do?

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Speeds up `tests/models/data2vec/test_modeling_data2vec_audio.py::Data2VecAudioModelTest::test_mask_feature_prob_ctc`


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Comments:
Speeds up data2vec test from 30s to 2s

_The documentation is not available anymore as the PR was closed or merged._

Thanks a lot!