Run tests in GitHub Actions for Django 4.2

Author: gvangool

.github/workflows/tests.yml

@@ -50,6 +50,13 @@ jobs:
           - python: "3.11"
             env: py311-django41
 
+          - python: "3.9"
+            env: py39-django42
+          - python: "3.10"
+            env: py310-django42
+          - python: "3.11"
+            env: py311-django42
+
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python }}
@@ -62,4 +69,4 @@ jobs:
           python -m pip install -e .
           pip install tox tox-gh-actions
       - name: Run tests using tox
-        run: tox -e ${{ matrix.env }}
+        run: tox -e ${{ matrix.env }}