Bump pillow from 6.2.0 to 9.3.0 in /requirements

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.0 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@6.2.0...9.3.0)

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -16,7 +16,7 @@ django-floppyforms==1.5.2
 django-model-utils==2.3.1
 
 # Images
-Pillow==6.2.0
+Pillow==9.3.0
 
 # For user registration, either via email or social
 # Well-built with regular release cycles!