Fix python versions used in test workflow

Author: mstoelzle

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
   test:
     strategy:
       matrix:
-        python: ['3.9', '3.10', '3.11']
+        python: ['3.10', '3.11', '3.12']
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: