Fix Django matrix (as django 4.0.* was not found)

Author: amureki

.github/workflows/ci.yml

@@ -53,9 +53,9 @@ jobs:
           - "3.9"
           - "3.10"
         django-version:
-          - 2.2.*
-          - 3.2.*
-          - 4.0.*
+          - "2.2"
+          - "3.2"
+          - "4.0"
     steps:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2