Bump bluefireteam/flutter-gh-pages from 7 to 9 (#20)

Bumps [bluefireteam/flutter-gh-pages](https://github.com/bluefireteam/flutter-gh-pages) from 7 to 9.
- [Commits](bluefireteam/flutter-gh-pages@v7...v9)

---
updated-dependencies:
- dependency-name: bluefireteam/flutter-gh-pages
  dependency-version: '9'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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.yml

@@ -11,6 +11,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
-      - uses: bluefireteam/flutter-gh-pages@v7
+      - uses: bluefireteam/flutter-gh-pages@v9
         with:
           baseHref: /pola-barcodes/