ci(Deps): bump subosito/flutter-action from 2.3.0 to 2.4.0 (#10)

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: subosito/flutter-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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/main.yml

@@ -51,7 +51,7 @@ jobs:
       run: bundle exec rake specs
 
     - name: Install Flutter
-      uses: subosito/flutter-action@v2.3.0
+      uses: subosito/flutter-action@v2.4.0
 
     - name: Setup Flutter for ios
       run: |