🤐 Fix deprecation warnings

[qgallouedec]

What does this PR do?

I realized that the deprecation warnings were not displayed because the deprecate_kwarg function compares the version passed as an argument (for us it's the TRL version) with the version of transformers. And if this version is higher, then the message is not displayed.

We could implement our own version of this decorator to use the TRL version (and not the transformers version), but the easiest way is to hack the function with the argument warn_if_greater_or_equal_version.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a GitHub issue? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.