Bump django from 3.2.20 to 4.2.5

Bumps [django](https://github.com/django/django) from 3.2.20 to 4.2.5.
- [Commits](django/django@3.2.20...4.2.5)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/base.txt

@@ -1,5 +1,5 @@
 # Django
-django==3.2.20
+django==4.2.5
 django-environ==0.11.2
 django-model-utils==4.3.1
 django-anymail[mailgun]==9.2