fix: upgrade actions-gh-pages to v4

Author: GenDelta

.github/workflows/ci.yaml

@@ -49,7 +49,7 @@ jobs:
           path: ./dist
 
       - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.CI_CD_TOKEN }}
           publish_dir: ./dist