Fix GitHub action for older Python versions

Author: Cito

.github/workflows/test.yml

@@ -9,7 +9,31 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13', 'pypy3.9', 'pypy3.10']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', 'pypy3.9', 'pypy3.10']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install "tox>=3.28,<5" "tox-gh-actions>=3.2,<4"
+
+      - name: Run unit tests with tox
+        run: tox
+
+  tests-old:
+    name: 🧪 Tests (older Python versions)
+    runs-on: ubuntu-22.04
+
+    strategy:
+      matrix:
+        python-version: ['3.7', '3.8']
 
     steps:
       - uses: actions/checkout@v4