run tests against both django 3.2 and 4.2

.github/workflows/tests.yml

@@ -13,6 +13,7 @@ jobs:
     strategy:
       matrix:
         python-version: [ "3.8", "3.9", "3.10", "3.11" ]
+        django-version: [ "3.2.*", "4.2.*" ]
 
     steps:
       - uses: actions/checkout@v4
@@ -21,7 +22,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: install dependencies
         run: |
-          pip install django==3.2.* 
+          pip install django==${{ matrix.django-version }}
           pip install -e .
           pip install coverage coveralls
       - name: run tests