chore(battery_plus): flutter_lints to ^4.0.0 (#2968)

Author: miquelbeltran

packages/battery_plus/battery_plus/example/pubspec.yaml

@@ -17,7 +17,7 @@ dev_dependencies:
     sdk: flutter
   integration_test:
     sdk: flutter
-  flutter_lints: ^3.0.1
+  flutter_lints: ^4.0.0
 
 flutter:
   uses-material-design: true

packages/battery_plus/battery_plus/pubspec.yaml

@@ -37,7 +37,7 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
   async: ^2.10.0
-  flutter_lints: ">=2.0.1 <4.0.0"
+  flutter_lints: ^4.0.0
   mockito: ^5.4.0
   plugin_platform_interface: ^2.1.4
 

packages/battery_plus/battery_plus_platform_interface/pubspec.yaml

@@ -17,4 +17,4 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ">=2.0.1 <4.0.0"
+  flutter_lints: ^4.0.0