Bump django-filter from 23.2 to 23.3 in /backend

Bumps [django-filter](https://github.com/carltongibson/django-filter) from 23.2 to 23.3.
- [Release notes](https://github.com/carltongibson/django-filter/releases)
- [Changelog](https://github.com/carltongibson/django-filter/blob/main/CHANGES.rst)
- [Commits](carltongibson/django-filter@23.2...23.3)

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

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

backend/requirements.txt

@@ -23,7 +23,7 @@ django==4.2.5
     #   djangorestframework-simplejwt
 django-apscheduler==0.6.2
     # via -r requirements.in
-django-filter==23.2
+django-filter==23.3
     # via -r requirements.in
 django-model-utils==4.3.1
     # via -r requirements.in