Bump django from 4.2.11 to 4.2.15 in /requirements

Bumps [django](https://github.com/django/django) from 4.2.11 to 4.2.15.
- [Commits](django/django@4.2.11...4.2.15)

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

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

requirements/linting-base.txt

@@ -1,2 +1,2 @@
-Django==4.2.11
+Django==4.2.15
 djangorestframework==3.14.0