Merge pull request #533 from ruby/dependabot/github_actions/actions/deploy-pages-4

Bump actions/deploy-pages from 3 to 4

Author: hsbt

.github/workflows/gh-pages.yml

@@ -43,4 +43,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v3
+        uses: actions/deploy-pages@v4