chore(deps): update Dart SDK constraints for compatibility

Updated the minimum required Dart SDK from 3.2.0 to 3.0.0 to ensure compatibility.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## 10.8.2
+
+* Updated the minimum required Dart SDK from `3.2.0` to `3.0.0` for improved compatibility.
+
 ## 10.8.1
 
 * Seperate [dart_quill_delta](https://pub.dev/packages/dart_quill_delta) version from [flutter_quill](https://pub.dev/packages/flutter_quill). Discussed in [Flutter Quill #2259](https://github.com/singerdmx/flutter-quill/issues/2259)

lib/src/operation/operation.dart

@@ -62,7 +62,7 @@ class Operation {
 
   /// Rich-text attributes set by this operation, can be `null`.
   Map<String, dynamic>? get attributes =>
-      _attributes == null ? null : Map<String, dynamic>.from(_attributes);
+      _attributes == null ? null : Map<String, dynamic>.from(_attributes!);
   final Map<String, dynamic>? _attributes;
 
   /// Creates new [Operation] from JSON payload.
@@ -110,7 +110,7 @@ class Operation {
   bool get isRetain => key == Operation.retainKey;
 
   /// Returns `true` if this operation has no attributes, e.g. is plain text.
-  bool get isPlain => _attributes == null || _attributes.isEmpty;
+  bool get isPlain => (_attributes == null || _attributes!.isEmpty);
 
   /// Returns `true` if this operation sets at least one attribute.
   bool get isNotPlain => !isPlain;
@@ -150,9 +150,9 @@ class Operation {
 
   @override
   int get hashCode {
-    if (_attributes != null && _attributes.isNotEmpty) {
+    if (_attributes != null && _attributes!.isNotEmpty) {
       final attrsHash =
-          hashObjects(_attributes.entries.map((e) => hash2(e.key, e.value)));
+          hashObjects(_attributes!.entries.map((e) => hash2(e.key, e.value)));
       return hash3(key, value, attrsHash);
     }
     return hash2(key, value);

pubspec.yaml

@@ -1,19 +1,19 @@
 name: dart_quill_delta
 description: "A Dart port of quill-js-delta, offering a simple and expressive JSON format for describing rich-text content and its changes."
-version: 10.8.1
+version: 10.8.2
 homepage: https://github.com/FlutterQuill/dart-quill-delta
 repository: https://github.com/FlutterQuill/dart-quill-delta
 issue_tracker: https://github.com/FlutterQuill/dart-quill-delta/issues
 documentation: https://github.com/FlutterQuill/dart-quill-delta
 
 environment:
-  sdk: ^3.2.3
+  sdk: ^3.0.0
 
 dependencies:
   collection: ^1.17.0
   diff_match_patch: ^0.4.1
   quiver: ^3.2.1
 
 dev_dependencies:
-  lints: ^4.0.0
-  test: ^1.24.0
+  lints: ^5.0.0
+  test: ^1.25.8