Bump peaceiris/actions-gh-pages from 3.6.1 to 3.9.3

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from 3.6.1 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@v3.6.1...v3.9.3)

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

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

.github/workflows/actions.yml

@@ -25,7 +25,7 @@ jobs:
  run: docker run -v ${PWD}/build:/root/scdocs scdocs /root/build_docs.sh
 
  - name: upload HTML documentation as gh-pages branch
- uses: peaceiris/actions-gh-pages@v3.6.1
+ uses: peaceiris/actions-gh-pages@v3.9.3
  if: success() && github.ref == 'refs/heads/main' # only deploy main
  with:
  github_token: ${{ secrets.GITHUB_TOKEN }}