Update to GitHub Pages workflow

Use the latest image and the currently highest tested Python version.

.github/workflows/gh-pages.yml

@@ -8,14 +8,14 @@ on:
 
 jobs:
   build-deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v1
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.10
       - name: Install
         run: |
           python -m pip install --upgrade pip