Bump peaceiris/actions-gh-pages from 3.9.2 to 3.9.3

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from 3.9.2 to 3.9.3.
- [Release notes](https://github.com/peaceiris/actions-gh-pages/releases)
- [Changelog](https://github.com/peaceiris/actions-gh-pages/blob/main/CHANGELOG.md)
- [Commits](peaceiris/actions-gh-pages@v3.9.2...v3.9.3)

---
updated-dependencies:
- dependency-name: peaceiris/actions-gh-pages
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/demo.yml

@@ -25,7 +25,7 @@ jobs:
           root: demo/output/
           css: true
           log_level: INFO
-      - uses: peaceiris/actions-gh-pages@v3.9.2
+      - uses: peaceiris/actions-gh-pages@v3.9.3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: demo/output