Bump subosito/flutter-action from 2.12.0 to 2.16.0 (#14)

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.12.0 to 2.16.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@v2.12.0...v2.16.0)

---
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>

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
           - stable
     steps:
       - uses: actions/checkout@v4.1.4
-      - uses: subosito/flutter-action@v2.12.0
+      - uses: subosito/flutter-action@v2.16.0
         with:
           sdk: "${{ matrix.sdk }}"
       - name: Install dependencies