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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -67,7 +67,7 @@ jobs:
       - name: Build docs
         run: yarn run docs:build
       - name: Deploy docs
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./docs/build