chore: bump bluefireteam/flutter-gh-pages from 7 to 8

Bumps [bluefireteam/flutter-gh-pages](https://github.com/bluefireteam/flutter-gh-pages) from 7 to 8. - [Release notes](https://github.com/bluefireteam/flutter-gh-pages/releases) - [Commits](bluefireteam/flutter-gh-pages@v7...v8) --- updated-dependencies: - dependency-name: bluefireteam/flutter-gh-pages dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/gh-pages.yml

@@ -11,6 +11,6 @@ jobs:
  steps:
  - uses: actions/checkout@v2 # Only works with v2
  - uses: subosito/flutter-action@v1
- - uses: bluefireteam/flutter-gh-pages@v7
+ - uses: bluefireteam/flutter-gh-pages@v8
  with:
  workingDir: example