Bump pillow from 10.4.0 to 11.1.0 in /server

Bumps [pillow](https://github.com/python-pillow/Pillow) from 10.4.0 to 11.1.0.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@10.4.0...11.1.0)

---
updated-dependencies:
- dependency-name: pillow
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

server/requirements.txt

@@ -19,4 +19,4 @@ dj-rest-auth[with_social]==6.0.0
 django-guardian==2.4.0
 django-allauth==0.61.1
 djangorestframework-simplejwt==5.3.1
-pillow==10.4.0
+pillow==11.1.0