build with Python 3.12

Author: jschlyter

.github/workflows/test.yml

@@ -28,6 +28,7 @@ jobs:
           - "3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}