Run CI tests with Python 3.12

Author: jsharkey13

.github/workflows/python-app.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Python 3.10
+    - name: Set up Python 3.12
       uses: actions/setup-python@v5
       with:
-        python-version: '3.10'
+        python-version: '3.12'
         cache: 'pip'
     - name: Install dependencies
       run: |