Fix CI hfh token warning

[albertvillanova]

In our CI, we get warnings from hfh about using deprecated token: https://github.com/huggingface/datasets/actions/runs/3174626525/jobs/5171672431

tests/test_upstream_hub.py::TestPushToHub::test_push_dataset_dict_to_hub_private
tests/test_upstream_hub.py::TestPushToHub::test_push_dataset_dict_to_hub
tests/test_upstream_hub.py::TestPushToHub::test_push_dataset_dict_to_hub_multiple_files
tests/test_upstream_hub.py::TestPushToHub::test_push_dataset_dict_to_hub_multiple_files_with_max_shard_size
tests/test_upstream_hub.py::TestPushToHub::test_push_dataset_dict_to_hub_overwrite_files
  C:\hostedtoolcache\windows\Python\3.7.9\x64\lib\site-packages\huggingface_hub\utils\_deprecation.py:97: FutureWarning: Deprecated argument(s) used in 'dataset_info': token. Will not be supported from version '0.12'.
    warnings.warn(message, FutureWarning)

This PR fixes the tests in TestPushToHub so that we fix these warnings.

Continuation of:

• Support hfh 0.10 implicit auth #5031

CC: @lhoestq

[HuggingFaceDocBuilderDev]

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

[lhoestq]

good catch !