Bump pillow from 9.0.0 to 9.1.0 (#380)

Bumps [pillow](https://github.com/python-pillow/Pillow) from 9.0.0 to 9.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@9.0.0...9.1.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

requirements/base.txt

@@ -10,7 +10,7 @@ django-recaptcha==2.0.6
 django-taggit==3.0.0
 ipython==7.33.0
 Markdown==3.3.4
-Pillow==9.0.0
+Pillow==9.1.0
 Pygments==2.12.0
 python-akismet==0.4.2
 requests==2.26.0