Upgrade to Python 3.11

Author: mraible

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.11'
           cache: 'pip'
       - name: Install Python dependencies
         run: pip install -r requirements.txt