chore: excluded python 3.9/Django 5 tox combo

.github/workflows/tox.yml

@@ -12,7 +12,9 @@ jobs:
       matrix:
         python-version: [ '3.9', '3.10', '3.11', '3.12' ]
         django-version: [ ">=3,<4", ">=4,<5", ">=5,<6" ]
-
+        exclude:
+          - python-version: '3.9'
+            django-version: '>=5,<6'
     steps:
       #----------------------------------------------
       #       check-out repo and set-up python