Exclude unsupported Python version by Django version

Author: peterfarrell

.github/workflows/python-package.yml

@@ -22,7 +22,17 @@ jobs:
           django-version: "4.2"
         - python-version: "3.13"
           django-version: "5.1"
-
+        exclude:
+          # Python 3.9 is incompatible with Django v5+
+          - django-version: 5.0
+            python-version: 3.9
+          - django-version: 5.1
+            python-version: 3.9
+          - django-version: 5.2
+            python-version: 3.9
+          # Django 4.2 is incompatible with Python 3.13+
+          - django-version: 4.2
+            python-version: 3.13
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}