fix: increase python version for CI/CD testing to 3.12

Author: uwzm

.github/workflows/python-app.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v2
       with:
-        python-version: "3.8"
+        python-version: "3.12"
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip