build(deps): update django-filter requirement from ~=25.2.0 to ~=26.1.0

Updates the requirements on [django-filter](https://github.com/carltongibson/django-filter) to permit the latest version.
- [Release notes](https://github.com/carltongibson/django-filter/releases)
- [Changelog](https://github.com/carltongibson/django-filter/blob/main/CHANGES.rst)
- [Commits](carltongibson/django-filter@25.2...26.1)

---
updated-dependencies:
- dependency-name: django-filter
  dependency-version: '26.1'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,6 +1,6 @@
 Django~=6.0.0
 djangorestframework~=3.17.1
-django-filter~=25.2.0
+django-filter~=26.1.0
 django-debug-toolbar~=6.3.0
 django-dbbackup~=5.3.0
 -r requirements-test.txt

requirements-prod.txt

@@ -1,5 +1,5 @@
 Django~=6.0.0
 djangorestframework~=3.17.1
-django-filter~=25.2.0
+django-filter~=26.1.0
 psycopg~=3.3.4
 sqlparse~=0.5.5