python3Packages.django-apscheduler: don't pin django_5

pkgs/development/python-modules/django-apscheduler/default.nix

···
   setuptools,
   wheel,
   # dependencies
-  django_5,
+  django,
   apscheduler,
   # tests
   pytestCheckHook,
···
   ];
 
   dependencies = [
-    django_5
+    django
     apscheduler
   ];