build(deps): bump subosito/flutter-action from 1 to 2.2.0

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 1 to 2.2.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@v1...v2.2.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/flutter-ci.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: '11'
-      - uses: subosito/flutter-action@v1
+      - uses: subosito/flutter-action@v2.2.0
         with:
           flutter-version: '2.5.3'
       - uses: dart-lang/setup-dart@v1