CI/CD with Python 3.9 to 3.13

Author: hovey

.github/workflows/pytest.yml

@@ -16,9 +16,8 @@ jobs:
         # platform: [ubuntu-latest, macos-latest]
         # python-version: [3.9.5, 3.10.0]
         # python-version: [3.9.5]
-        python-version: [3.9]
-        # python-version: [3.10.0]
-        #python-version: [3.9, 3.10]
+        # python-version: [3.9]
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     runs-on: ${{ matrix.platform }}