chore(ci): expand test matrix to include Python 3.12 and 3.13

Author: davekrum

.github/workflows/python-tests.yml

@@ -15,6 +15,8 @@ jobs:
         python-version:
           - "3.9"
           - "3.11"
+          - "3.12"
+          - "3.13"
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}