Update dependency flutter_lints to v6

Author: renovate[bot]

packages/talker_dio_logger/example/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^2.0.0
+  flutter_lints: 6.0.0
 
 
 # For information on the generic Dart part of this file, see the

packages/talker_flutter/example/pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^1.0.0
+  flutter_lints: 6.0.0
 
 flutter:
   uses-material-design: true

packages/talker_flutter/pubspec.yaml

@@ -30,6 +30,6 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^2.0.1
+  flutter_lints: 6.0.0
 
 flutter:

packages/talker_http_logger/example/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
   equatable: ^2.0.7
 
 dev_dependencies:
-  flutter_lints: ^5.1.1
+  flutter_lints: 6.0.0
 
 dependency_overrides:
   talker_http_logger: