chore(deps): bump pillow from 11.0.0 to 11.1.0 in /backend

Bumps [pillow](https://github.com/python-pillow/Pillow) from 11.0.0 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@11.0.0...11.1.0)

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

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

backend/requirements.txt

@@ -16,7 +16,7 @@ inflection==0.5.1 ; python_version >= "3.12" and python_version < "4.0"
 jsonschema-specifications==2024.10.1 ; python_version >= "3.12" and python_version < "4.0"
 jsonschema==4.23.0 ; python_version >= "3.12" and python_version < "4.0"
 markdown==3.7 ; python_version >= "3.12" and python_version < "4.0"
-pillow==11.0.0 ; python_version >= "3.12" and python_version < "4.0"
+pillow==11.1.0 ; python_version >= "3.12" and python_version < "4.0"
 psycopg2-binary==2.9.10 ; python_version >= "3.12" and python_version < "4.0"
 python-dotenv==1.0.1 ; python_version >= "3.12" and python_version < "4.0"
 pyyaml==6.0.2 ; python_version >= "3.12" and python_version < "4.0"