Bump to actions/deploy-pages action from v2 to v4

Author: deewhyweb

.github/workflows/publish.yml

@@ -37,4 +37,4 @@ jobs:
           path: workshop/build/site
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4