Upgrade dependencies

Author: mvanbeusekom

example/pubspec.yaml

@@ -1,12 +1,12 @@
 name: example
 description: A new Flutter project.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+publish_to: "none" # Remove this line if you wish to publish to pub.dev
 
 version: 1.0.0
 
 environment:
   sdk: ^3.0.0
-  flutter: '>=3.19.0'
+  flutter: ">=3.19.0"
 
 dependencies:
   flutter:
@@ -17,7 +17,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^4.0.0
+  flutter_lints: ^6.0.0
 
 flutter:
-  uses-material-design: true
+  uses-material-design: true