Pre commit update

[lafrech]

The "extra require" dependency versions in setup.py are not the ones used in the CI tests.

CI tests use tox, which runs an old version of pre-commit, which in turn uses its own versions of lint dependencies.

• Update pre-commit version in tox.ini
• Update flake8-bugbear while I'm at it (it is not autoupdated)
• Remove lint dependencies listed in setup.py (apart from pre-commit)

This will save us a few useless dependabot PRs about unused stuff (leaving us with the false impression that our dependencies are up-to-date). We still need to update pre-commit in tox.ini manually because dependabot won't pick that up.

Users are advised to call pre-commit to run CI, either automatically on commit or using

pre-commit run --all-files