Fixed Django version install in test workflow

Author: claudep

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade django~=${{ matrix.django-version }}
+          python -m pip install --upgrade django~=${{ matrix.django-version }}.0
           python -m pip install --upgrade requests
           python -m pip install --upgrade requests_mock