Bump pillow from 8.4.0 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.4.0 to 9.3.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@8.4.0...9.3.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
...

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

requirements.txt

@@ -23,7 +23,7 @@ pandas==1.1.5
     # via
     #   pctk (setup.py)
     #   seaborn
-pillow==8.4.0
+pillow==9.3.0
     # via matplotlib
 pyparsing==3.0.9
     # via matplotlib