Bump pillow from 6.2.2 to 9.0.1

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.2.2 to 9.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@6.2.2...9.0.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 django==2.2.13
 djangorestframework==3.11.0
 psycopg2>=2.7.5,<2.8.0
-Pillow==6.2.2
+Pillow==9.0.1
 dj-database-url==0.5.0
 django-filter==2.2.0
 django-heroku==0.3.1