Bump peaceiris/actions-gh-pages from v3.7.3 to v3.8.0 (#23)

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from v3.7.3 to v3.8.0.
- [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@v3.7.3...068dc23)

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

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

Author: dependabot[bot]

.github/workflows/deploy.yaml

@@ -59,7 +59,7 @@ jobs:
       # Push the book's HTML to github-pages
       - name: Deploy to GitHub pages
         if: github.ref == 'refs/heads/main'
-        uses: peaceiris/actions-gh-pages@v3.7.3
+        uses: peaceiris/actions-gh-pages@v3.8.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./_build/html