Update peaceiris/actions-gh-pages action to v4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -147,7 +147,7 @@ jobs:
           
       - name: 📊 Deploy to GitHub Pages
         if: github.ref == 'refs/heads/main' && matrix.node-version == '20.x'
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./gh-pages