chore: Update python Docker tag to v3.11

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -11,7 +11,7 @@ permissions:
 jobs:
   github-pages:
     runs-on: ubuntu-latest
-    container: python:3.8
+    container: python:3.11
     steps:
       - uses: actions/checkout@v3
       - name: Install system dependencies.

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: python:3.8
+    container: python:3.11
     steps:
       - uses: actions/checkout@v3
       - name: Install the site-generator