Bump pillow from 6.1.0 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.1.0 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@6.1.0...9.3.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -56,7 +56,7 @@ mccabe==0.6.1
 oauthlib==3.1.0
 packaging==20.4
 pep8==1.7.1
-Pillow==6.1.0
+Pillow==9.3.0
 pipenv==2018.11.26
 pluggy==0.13.1
 psycopg2==2.8.3