[deps] Update django requirement

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Commits](django/django@3.2.18...5.1)

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

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

requirements.txt

@@ -1,5 +1,5 @@
 # Does not supports Django 4.0.0
-django>=3.2.18,!=4.0.*,<4.3
+django>=3.2.18,!=4.0.0.a,<5.2
 channels~=3.0.4
 django-leaflet~=0.30.1
 Pillow~=10.4.0