chore(deps): update dependency django to v6

Author: renovate[bot]

requirements.txt

@@ -11,7 +11,7 @@ certifi==2025.11.12
 cffi==2.0.0
 # For Azure Tenant auth
 cryptography==46.0.3
-Django==5.2.9
+Django==6.0
 django-appconf==1.2.0
 django-auth-ldap==5.3.0
 django-celery-beat==2.8.1