Add matrix for python versions

Author: smokestacklightnin

.github/workflows/ci-test.yml

@@ -16,13 +16,18 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
 
+    version_matrix:
+      strategy:
+        matrix:
+          python-version: ['3.9', '3.10', '3.11']
+
     steps:
     - uses: actions/checkout@v4
 
-    - name: Set up Python 3.9
+    - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:
-        python-version: '3.9'
+        python-version: ${{ matrix.python-version }}
         cache: 'pip'
         cache-dependency-path: |
           setup.py