feat: upgrade to Flutter 3.16.0 and Dart 3.2

Author: elementlo

lib/model/model.dart

@@ -17,7 +17,7 @@ class VerboseTodo {
   VerboseTodo(this.todo, this.category);
 }
 
-abstract class ModelMixin {
+abstract mixin class ModelMixin {
   Map<String, dynamic> toJson();
 }
 

pubspec.yaml

@@ -17,10 +17,11 @@ publish_to: "none"
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 0.3.0-beta.1
+version: 0.3.0-beta.2
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ^3.2.0
+  flutter: '>=3.6.0'
 
 dependencies:
   flutter:
@@ -32,13 +33,13 @@ dependencies:
   fluttertoast: ^8.0.9
   synchronized: ^3.0.0+3
   animated_text_kit: ^4.2.2
-  flutter_local_notifications: ^14.0.0+1
+  flutter_local_notifications: ^16.1.0
   cupertino_icons: ^1.0.5
-  syncfusion_flutter_datepicker: ^21.2.4
+  syncfusion_flutter_datepicker: ^23.2.4
   day_night_time_picker: ^1.1.3
   flutter_native_timezone: ^2.0.0
   #  intl: ^0.18.1
-  package_info_plus: ^4.0.0
+  package_info_plus: ^5.0.1
   lottie: ^2.3.2
   flutter_easyloading: ^3.0.5
   url_launcher: ^6.1.6
@@ -51,7 +52,7 @@ dependencies:
   dio: ^5.1.2
   linkwell: ^2.0.6
   amap_flutter_location: ^3.0.0
-  permission_handler: ^10.1.0
+  permission_handler: ^11.0.1
   flutter_qweather: ^0.0.10
 
 dev_dependencies: