Bump pillow from 9.1.0 to 9.1.1

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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements_test.txt

@@ -5,7 +5,7 @@ scipy==1.8.0
 matplotlib==3.5.2
 scikit-learn>=0.22.2,<1.2.0
 six==1.16.0
-Pillow==9.1.0
+Pillow==9.1.1
 tqdm==4.64.0
 statsmodels==0.13.2
 pydub==0.25.1