Bump pillow from 9.1.0 to 9.1.1 (#942)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.1.0 to 9.1.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.1.0...9.1.1)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_dev.txt

@@ -4,7 +4,7 @@
 #---------------------------------------------------------
 coveralls==3.3.1
 flake8==4.0.1
-pillow==9.1.0
+pillow==9.1.1
 pytest==7.1.2
 pytest-cache==1.0
 pytest-cov==3.0.0