Update python-test.yaml with 3.12 (#1030)

Author: pamelafox

.github/workflows/python-test.yaml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-20.04", "windows-latest"]
-        python_version: ["3.9", "3.10", "3.11"]
+        python_version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
         - uses: actions/checkout@v4
         - name: Setup python