ci: Use image ubuntu-latest

Author: SilverRainZ

.github/workflows/pages.yml

@@ -13,7 +13,7 @@ concurrency:
 
 jobs:
   pages:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}