chore: pin Ubuntu LTS version, bump python to 3.11

Author: libremente

.github/workflows/publish.yml

@@ -8,12 +8,12 @@ on:
 
 jobs:
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - 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 .