build(deps): update djangorestframework requirement

Updates the requirements on [djangorestframework](https://github.com/encode/django-rest-framework) to permit the latest version.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.15.2...3.16.1)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,5 +1,5 @@
 Django~=5.1.0
-djangorestframework~=3.15.2
+djangorestframework~=3.16.1
 django-filter~=24.2.0
 django-debug-toolbar~=5.0.1
 django-dbbackup~=4.2.0

requirements-prod.txt

@@ -1,5 +1,5 @@
 Django~=5.1.0
-djangorestframework~=3.15.0
+djangorestframework~=3.16.1
 django-filter~=24.3.0
 psycopg2~=2.9.10
 sqlparse~=0.5.1