[tests] Specific tests for python 3.9

Author: Pierre-Sassoulas

.github/workflows/ci.yml

@@ -11,8 +11,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         django-version: ["2.2.28", "3.2.25", "4.2.20", "5.0.14", "5.1.8", "5.2"]
+        include:
+          - python-version: 3.9
+            django-version: 2.2.28
+          - python-version: 3.9
+            django-version: 3.2.25
+          - python-version: 3.9
+            django-version: 4.2.20
     steps:
       - uses: actions/checkout@v2
       - name: Python ${{ matrix.python-version }} django ${{ matrix.django-version }}