build: (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](https://github.com/peaceiris/actions-gh-pages/compare/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] <support@github.com>

.github/workflows/main_deploy.yaml

@@ -30,7 +30,7 @@ jobs:
         run: flutter build web --dart-define=FLUTTER_WEB_CANVASKIT_URL=canvaskit/ --release --source-maps --base-href "/nightly/"
       - run: mv build/web/ public
       - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           personal_token: ${{ secrets.PAGES_DEPLOY_TOKEN }}
           publish_dir: ./public

.github/workflows/release.yaml

@@ -59,7 +59,7 @@ jobs:
           cp public/web -r public/nightly
       - name: Deploy to GitHub Pages
         if: startsWith(github.ref, 'refs/tags/v')
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           personal_token: ${{ secrets.PAGES_DEPLOY_TOKEN }}
           publish_dir: ./public