Bump django from 3.2.25 to 4.2.16 in /requirements

Bumps [django](https://github.com/django/django) from 3.2.25 to 4.2.16.
- [Commits](django/django@3.2.25...4.2.16)

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

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

requirements/base.txt

@@ -1,5 +1,5 @@
 # Django
-django==3.2.25
+django==4.2.16
 django-environ==0.11.2
 django-model-utils==4.5.1
 django-anymail[mailgun]==9.2