Bump peaceiris/actions-gh-pages from 3 to 4

Bumps [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) from 3 to 4.
- [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...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/gh-pages.yml

@@ -58,7 +58,7 @@ jobs:
         continue-on-error: true
 
       - name: Deploy main branch
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         if: github.ref == 'refs/heads/main'
         with:
           github_token: ${{ secrets.PUBLISH_TOKEN }}
@@ -76,7 +76,7 @@ jobs:
           HUGO_ENV: staging
 
       - name: Deploy to PR preview
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         if: github.ref != 'refs/heads/main'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/pr-close.yml

@@ -13,7 +13,7 @@ jobs:
         run: mkdir public
 
       - name: Delete folder
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./public