chore: bump Python version to 3.11

Author: libremente

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
-          python-version: '3.9'
+          python-version: '3.11'
 
       - run: pip install -r requirements.txt
       - run: sphinx-build docs/standard build -c .