feat: replace flutter format with dart format (#95)

Author: erickzanardo

.github/workflows/flutter_package.yml

@@ -75,7 +75,7 @@ jobs:
         run: ${{inputs.setup}}
 
       - name: ✨ Check Formatting
-        run: flutter format --set-exit-if-changed lib test
+        run: dart format --set-exit-if-changed lib test
 
       - name: 🕵️ Analyze
         run: flutter analyze lib test