Bump pillow from 3.0.0 to 9.0.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 3.0.0 to 9.0.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@3.0.0...9.0.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -24,7 +24,7 @@ futures==3.3.0
 jsonfield==1.0.3
 kombu==3.0.30
 metron==1.3.7
-Pillow==3.0.0
+Pillow==9.0.0
 pinax-invitations==4.0.4
 pinax-theme-bootstrap==7.2.0
 pinax-types==0.10.0