Update pubspec.yaml

Author: LavanyaA

pubspec.yaml

@@ -4,7 +4,7 @@ version: 28.1.33
 homepage: https://github.com/syncfusion/flutter-examples
 
 environment:
- sdk: ">=2.17.0 <3.0.0"
+ sdk: ">=3.3.0 <4.0.0"
 
 dependencies:
  flutter_test: