Bump pillow from 3.3.1 to 9.3.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 3.3.1 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@3.3.1...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

@@ -55,7 +55,7 @@ lxml==3.6.4
 mccabe==0.5.2
 oauthlib==2.0.1
 pep8==1.6.2
-pillow==3.3.1
+pillow==9.3.0
 pinax-theme-bootstrap==3.0a11
 pinax-theme-bootstrap-account==1.0b2
 pycsw==2.0.2