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

Author: renovate[bot]

.github/workflows/rustdoc.yml

@@ -28,7 +28,7 @@ jobs:
         run: cargo doc --all --no-deps
 
       - name: Deploy Docs
-        uses: peaceiris/actions-gh-pages@v3.9.3
+        uses: peaceiris/actions-gh-pages@v4.0.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: gh-pages