build(deps): bump django from 4.2.14 to 4.2.15 in /requirements

Bumps [django](https://github.com/django/django) from 4.2.14 to 4.2.15.
- [Commits](django/django@4.2.14...4.2.15)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/base.txt

@@ -1,5 +1,5 @@
 # Django
-django==4.2.14
+django==4.2.15
 django-environ==0.11.2
 django-bootstrap-breadcrumbs==0.9.2