Bump pillow from 9.0.1 to 9.1.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.0.1 to 9.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.0.1...9.1.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]