ci: move flake8 GA to py311

Author: mrava87

.github/workflows/flake8.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Set up Python environment
         uses: actions/setup-python@v5
         with:
-          python-version: "3.8"
+          python-version: "3.11"
       - name: flake8 Lint
         uses: py-actions/flake8@v2
         with: