upgrade github actions, py version

Author: ThomasWaldmann

.github/workflows/main.yml

@@ -8,10 +8,10 @@ jobs:
   update-web:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: actions/setup-python@v4
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v5
       with:
-         python-version: '3.10'
+         python-version: '3.11'
     - name: Publish pages to web
       shell: bash
       env: