Update django requirement from <5.0 to <6.0

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Commits](django/django@1.0...5.1)

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

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

setup.cfg

@@ -43,7 +43,7 @@ meta = *.html *.png *.gif *js *jpg *jpeg *svg *py *mo *po
 
 [options.extras_require]
 docs =
-	django<5.0
+	django<6.0
 	sphinx-rtd-theme
 
 [sdist]