chore(deps): update peaceiris/actions-gh-pages action to v4

Author: renovate[bot]

.github/workflows/gh-pages.yml

@@ -26,7 +26,7 @@ jobs:
         run: cd exampleSite && hugo --minify --gc
 
       - name: Deploy 🚀
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./exampleSite/public