CI: skip failing TF hubert test
# What does this PR do?


cc @amyeroberts <|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>@gante is this issue fixed? I am asking because I am still getting this error [here](https://app.circleci.com/pipelines/github/huggingface/transformers/57650/workflows/dcdbb1bd-f61c-445a-b276-4f649416931e/jobs/699951?invite=true#step-111-4137) in this [PR](https://github.com/huggingface/transformers/pull/21349) . I did rebase to `upstream/main` .<|||||>@susnato see #21606 (I skipped the wrong one here)<|||||>Hi @gante thanks for the fix but now there seems to be a new issue popping up regarding that same model, 
```
tests/models/hubert/test_modeling_tf_hubert.py::TFHubertRobustModelTest::test_keras_fit
```
This test is failing in the same PR I mentioned above. I did rebase before pushing.