CI: pip install now updates
# What does this PR do?

Follow up from https://github.com/huggingface/transformers/pull/16751: `pip install` in non-remote GHA workflows now updates packages, to allow us to override pre-installed versions.
This PR actually needs further changes, the adding `-U` doesn't solve it (possibly because of other version requirements in the packages installed in the image). 

Should I update the dependencies of click (to `click>=8.0`, required by black) and protobuf (to `protobuf>=3.8.0`, required by tensorflow)? cc @LysandreJik @sgugger <|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>It would be nice to find a general solution that won't have us needing to add a new dependency update in three weeks.<|||||>(closing the PR after some offline discussion -- going to attempt to change to cache fresh venvs instead)