Bump subosito/flutter-action from 2.15.0 to 2.16.0 (#64)

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.15.0 to 2.16.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@3d80492...44ac965)

---
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/ci.yml

@@ -68,7 +68,7 @@ jobs:
         flutter-channel: [beta, stable]
     steps:
     - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
-    - uses: subosito/flutter-action@3d804929922b667a63a229bc59037807f969e885
+    - uses: subosito/flutter-action@44ac965b96f18d999802d4b807e3256d5a3f9fa1
       with:
         channel: ${{ matrix.flutter-channel }}
     - id: install