Update django-filter requirement from <23.4,>=2.4 to >=2.4,<23.6

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@2.4.0...23.5)

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

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

requirements.txt

@@ -1,7 +1,7 @@
 django>=4.2,<4.3
 djangorestframework>=3.12,<3.15
 markdown>=3.2,<3.6
-django-filter>=2.4,<23.4
+django-filter>=2.4,<23.6
 django-cors-headers>=4.0,<4.4
 django-userforeignkey>=0.3,<0.6
 django-rest-multitokenauth>=1.4.0,<1.6.0