Update auto-publish.yml

Author: hoch

.github/workflows/auto-publish.yml

@@ -9,14 +9,14 @@ on:
 jobs:
   main:
     name: Setup, build, and Deploy to gh-pages branch
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checking out the repository
         uses: actions/checkout@v4
-      - name: Setting up Python 3.7
+      - name: Setting up Python 3.9
         uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.9'
       - name: Installing and updating Bikeshed
         run: pip3 install bikeshed && bikeshed update
         shell: bash