chore(deps): bump djangorestframework from 3.16.0 to 3.16.1 in /backend (#835)

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.16.0 to 3.16.1.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.16.0...3.16.1)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-version: 3.16.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/poetry.lock

@@ -26,7 +26,7 @@ django = "~5.2.4"
 django-cors-headers = "^4.7.0"
 django-filter = "^25.1"
 django-prometheus = "^2.4.1"
-djangorestframework = "^3.16.0"
+djangorestframework = "^3.16.1"
 djangorestframework-jsonapi = "^8.0.0"
 mozilla-django-oidc = "^4.0.1"
 pytz = "^2025.2"