Bump peaceiris/actions-gh-pages from 3 to 4 in the actions group (#201)

Bumps the actions group with 1 update: [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages).


Updates `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
  dependency-group: actions
...

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

.github/workflows/documentation.yaml

@@ -76,7 +76,7 @@ jobs:
           sphinx-build website _build
 
       - name: Deploy to beta site
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         # only update beta site if base and head branches match, not for forks
         # forks cannot access secrets to deploy, see: https://github.com/orgs/community/discussions/26829
         if: ${{ (github.event.pull_request.base.repo.full_name == github.event.pull_request.head.repo.full_name) }}
@@ -88,7 +88,7 @@ jobs:
           force_orphan: true
 
       - name: Deploy to production
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         # only update on either a push on main, or published release on the main
         if: ${{ (github.ref == 'refs/heads/main' && github.event_name == 'push') || (github.event.release.target_commitish == 'main' && github.event_name == 'release' && github.event.action == 'published') }}
         with: