Update workflow to target 3.12

Author: delfanbaum

.github/workflows/workflow.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.9", "3.12"]
 
     steps:
       - uses: actions/checkout@v3