chore(deps): bump subosito/flutter-action from 1 to 2 (#1394)

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 1 to 2.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](https://github.com/subosito/flutter-action/compare/v1...v2)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/test_mobile.yml

@@ -26,7 +26,7 @@ jobs:
         if: steps.android-sdk.outputs.cache-hit != 'true'
         uses: android-actions/setup-android@v2
       - name: Setup Flutter SDK
-        uses: subosito/flutter-action@v1
+        uses: subosito/flutter-action@v2
         with:
           channel: 'stable'
       - name: Run integration tests