bump python version

Author: mspruc

.github/workflows/backend.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8.10'
+          python-version: '3.11'
           cache: 'pip'
       - name: Install Python dependencies
         run: |