chore(deps): 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-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/cd.yml

@@ -103,7 +103,7 @@ jobs:
           flutter build web --release --base-href ${{ env.BASE_HREF }} --build-number ${{ env.BUILD_NUMBER }}
 
       - name: 🚀 Deploy to Github Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         env:
           RELEASE_TAG: ${{ needs.deps.outputs.release-tag }}
           BUILD_NUMBER: ${{ steps.build-number.outputs.build_number }}