Add more Python versions to GH test matrix

Author: lunkwill42

.github/workflows/tox.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9, 3.10, 3.11]
 
     steps:
     - uses: actions/checkout@v4