chore(deps): bump django in /appengine/flexible/django_cloudsql

Bumps [django](https://github.com/django/django) from 6.0.1 to 6.0.5.
- [Commits](django/django@6.0.1...6.0.5)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 6.0.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

appengine/flexible/django_cloudsql/requirements.txt

@@ -1,4 +1,4 @@
-Django==6.0.1; python_version >= "3.12"
+Django==6.0.5; python_version >= "3.12"
 gunicorn==23.0.0
 psycopg2-binary==2.9.11
 django-environ==0.12.0