Repository: pykeen/pykeen
Issue: 504 Server Error for dataset access
Root cause: External Dependency Breakage

### Describe the bug

When I run a pykeen instance to execute  `get_dataset(dataset='FB15k')`, it raises error like that
```
requests.exceptions.HTTPError: 504 Server Error: Gateway Time-out for url: https://everest.hds.utc.fr/lib/exe/fetch.php?media=en:fb15k.tgz
```

### How to reproduce

Just run a pykeen instance. It seems just a server 504 error rather than pykeen bug,

### Environment


| Key             | Value                    |
|-----------------|--------------------------|
| OS              | posix                    |
| Platform        | Linux                    |
| Release         | 5.4.143.bsk.7-amd64      |
| Time            | Sun Mar 19 13:37:50 2023 |
| Python          | 3.9.2                    |
| PyKEEN          | 1.10.1                   |
| PyKEEN Hash     | UNHASHED                 |
| PyKEEN Branch   |                          |
| PyTorch         | 2.0.0+cu117              |
| CUDA Available? | true                     |
| CUDA Version    | 11.7                     |
| cuDNN Version   | 8500                     |

### Additional information

_No response_

### Issue Template Checks

- [X] This is not a feature request (use a different issue template if it is)
- [X] This is not a question (use the [discussions](https://github.com/pykeen/pykeen/discussions/new) forum instead)
- [X] I've read the text explaining why including environment information is important and understand if I omit this information that my issue will be dismissed

I can reproduce this, and also get [504](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/504). 

We do not host datasets ourselves, but rather linked to the original providers. For fb15k, it seems that this server is currently not responding properly.

If you still have the original zip archive lying around, you can unpack that into `~/.data/pykeen/datasets/fb15k/FB15k` to avoid having to download it from the non-responding server.
The content of this directory would look like this:
```
$ ls ~/.data/pykeen/datasets/fb15k/FB15k
freebase_mtr100_mte100-test.txt  freebase_mtr100_mte100-train.txt  freebase_mtr100_mte100-valid.txt  README
```

> I can reproduce this, and also get [504](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/504).
> 
> We do not host datasets ourselves, but rather linked to the original providers. For fb15k, it seems that this server is currently not responding properly.
> 
> If you still have the original zip archive lying around, you can unpack that into `~/.data/pykeen/datasets/fb15k/FB15k` to avoid having to download it from the non-responding server. The content of this directory would look like this:
> 
> ```
> $ ls ~/.data/pykeen/datasets/fb15k/FB15k
> freebase_mtr100_mte100-test.txt  freebase_mtr100_mte100-train.txt  freebase_mtr100_mte100-valid.txt  README
> ```

Thank you for your response!

However, it makes me surprised that the default in-built datasets are not hosted by yourself, which may be a bottleneck of the reliablity of pykeen. Or, maybe providing an alternative download link as a part of configuration would be a good choice?