Release 9.0.1 on February 3, 2022

[radarhere]

• Make necessary changes in main branch.
• Update CHANGES.rst.
• Check out release branch e.g.:

git checkout -t remotes/origin/9.0.x

• Cherry pick individual commits from main branch to release branch e.g. 9.0.x, then git push.
• Check GitHub Actions and AppVeyor to confirm passing tests in release branch e.g. 9.0.x.
• In compliance with PEP 440, update version identifier in src/PIL/_version.py
• Run pre-release check via make release-test.
• Create tag for release e.g.:

git tag 9.0.1
git push
git push --tags

• Create and check source distribution:

make sdist
twine check dist/*

• Create binary distributions
• Check and upload all binaries and source distributions e.g.:

twine check dist/*
twine upload dist/Pillow-9.0.1*

• Publish the release on GitHub

[radarhere]

@cgohlke at your convenience, would you be able to put together wheels?

[radarhere]

Thanks very much!

Released, and announced!

[radarhere]

I've uploaded additional macOS M1 wheels, with a build number of 1, to resolve #6015