Bump django in /samples/django-channels-redis-postgres/app

Bumps [django](https://github.com/django/django) from 5.1 to 5.1.13.
- [Commits](django/django@5.1...5.1.13)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 5.1.13
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/django-channels-redis-postgres/app/requirements.txt

@@ -11,7 +11,7 @@ constantly==23.10.4
 cryptography==43.0.0
 daphne==4.1.2
 dj-database-url==2.2.0
-Django==5.1
+Django==5.1.13
 gitdb==4.0.11
 GitPython==3.1.41
 gunicorn==23.0.0