chore(deps): bump peaceiris/actions-gh-pages from 2.5.0 to 3.8.0

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from 2.5.0 to 3.8.0.
- [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@v2.5.0...v3.8.0)

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

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

Author: dependabot[bot]

.github/workflows/gh-pages.yaml

@@ -20,7 +20,7 @@ jobs:
       - run: pip install mkdocs==1.0.4 mkdocs_material==4.1.1
       - run: mkdocs build
       - run: make parse-examples
-      - uses: peaceiris/actions-gh-pages@v2.5.0
+      - uses: peaceiris/actions-gh-pages@v3.8.0
         env:
           PERSONAL_TOKEN: ${{ secrets.PERSONAL_TOKEN }}
           PUBLISH_BRANCH: gh-pages