Bump pillow from 6.1.0 to 9.0.0

Bumps [pillow](https://github.com/python-pillow/Pillow) from 6.1.0 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@6.1.0...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

@@ -4,7 +4,7 @@ clear-screen==0.1.12
 Django>=2.2.4
 django-crispy-forms==1.7.2
 kombu==4.6.3
-Pillow==6.1.0
+Pillow==9.0.0
 pytz==2019.1
 sqlparse==0.3.0
 vine==1.3.0