Bump peaceiris/actions-gh-pages from 3.9.2 to 3.9.3 (#313)

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@bd8c6b0...373f7f2)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -52,7 +52,7 @@ jobs:
         run: make build_pdf
 
       - name: Deploy documentation
-        uses: peaceiris/actions-gh-pages@bd8c6b06eba6b3d25d72b7a1767993c0aeee42e7
+        uses: peaceiris/actions-gh-pages@373f7f263a76c20808c831209c920827a82a2847
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./build/dirhtml