Bump pillow from 8.3.2 to 9.3.0 in /src/requirements

Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.3.2 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@8.3.2...9.3.0)

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

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

src/requirements/common.txt

@@ -13,6 +13,6 @@ google-api-python-client==1.6.2
 gunicorn==20.1.0
 markdown==2.6.8
 mysqlclient==1.4.6
-Pillow==8.3.2
+Pillow==9.3.0
 python-dateutil==2.6.0
 pytils==0.3