Update pillow requirement from ~=11.0.0 to ~=11.1.0

Updates the requirements on [pillow](https://github.com/python-pillow/Pillow) to permit the latest version.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](python-pillow/Pillow@11.0.0...11.1.0)

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

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

requirements.txt

@@ -1,5 +1,5 @@
 django~=5.1.4
-pillow~=11.0.0
+pillow~=11.1.0
 django-crispy-forms~=2.3
 crispy-bulma~=0.11.0
 django-environ~=0.11.2