Update django requirement from <5,>=4.2.14 to >=4.2.14,<6

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Commits](django/django@4.2.14...5.1.3)

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

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

requirements.txt

@@ -1,2 +1,2 @@
 # Used by readthedocs.org to build the documentation
-Django>=4.2.14,<5
+Django>=4.2.14,<6