chore: Upgrade to Flutter 3.32 and flutter_lints 6.0.0

- Update Flutter SDK constraint from 3.16.0 to 3.32.0
- Update Dart SDK constraint from 3.2.0 to 3.5.0 for workspace support
- Upgrade flutter_lints from ^5.0.0 to ^6.0.0
- All packages pass static analysis with no issues

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ened

example/pubspec.yaml

@@ -3,7 +3,7 @@ description: Demonstrates how to use the workmanager plugin.
 publish_to: 'none'
 
 environment:
-  sdk: ">=3.2.0 <4.0.0"
+  sdk: ">=3.5.0 <4.0.0"
 
 dependencies:
   path_provider: ^2.1.5 

workmanager/pubspec.yaml

@@ -7,8 +7,8 @@ repository: https://github.com/fluttercommunity/flutter_workmanager
 issue_tracker: https://github.com/fluttercommunity/flutter_workmanager/issues
 
 environment:
-  sdk: '>=3.2.0 <4.0.0'
-  flutter: ">=3.16.0"
+  sdk: '>=3.5.0 <4.0.0'
+  flutter: ">=3.32.0"
 
 dependencies:
   flutter:
@@ -23,7 +23,7 @@ dev_dependencies:
   get_it: ^8.0.0
   flutter_test:
     sdk: flutter
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
 
 flutter:
   plugin:

workmanager_android/pubspec.yaml

@@ -7,8 +7,8 @@ repository: https://github.com/fluttercommunity/flutter_workmanager
 issue_tracker: https://github.com/fluttercommunity/flutter_workmanager/issues
 
 environment:
-  sdk: '>=3.2.0 <4.0.0'
-  flutter: ">=3.16.0"
+  sdk: '>=3.5.0 <4.0.0'
+  flutter: ">=3.32.0"
 
 dependencies:
   flutter:
@@ -18,7 +18,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
 
 flutter:
   plugin:

workmanager_ios/pubspec.yaml

@@ -7,8 +7,8 @@ repository: https://github.com/fluttercommunity/flutter_workmanager
 issue_tracker: https://github.com/fluttercommunity/flutter_workmanager/issues
 
 environment:
-  sdk: '>=3.2.0 <4.0.0'
-  flutter: ">=3.16.0"
+  sdk: '>=3.5.0 <4.0.0'
+  flutter: ">=3.32.0"
 
 dependencies:
   flutter:
@@ -18,7 +18,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
 
 flutter:
   plugin:

workmanager_platform_interface/pubspec.yaml

@@ -7,8 +7,8 @@ repository: https://github.com/fluttercommunity/flutter_workmanager
 issue_tracker: https://github.com/fluttercommunity/flutter_workmanager/issues
 
 environment:
-  sdk: '>=3.2.0 <4.0.0'
-  flutter: ">=3.16.0"
+  sdk: '>=3.5.0 <4.0.0'
+  flutter: ">=3.32.0"
 
 dependencies:
   flutter:
@@ -19,5 +19,5 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0