chore(deps): update subosito/flutter-action action to v2.6.1 (#24)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/flutter-test.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: subosito/flutter-action@v2.4.0
+      - uses: subosito/flutter-action@v2.6.1
         with:
           channel: 'stable'