Fix flutter analysis warrning

pubspec.yaml

@@ -31,7 +31,6 @@ platforms:
 
 environment:
   sdk: '>=3.1.5 <4.0.0'
-  # sdk: ">=2.17.0 <4.0.0"
   flutter: ">=3.10.0"
 
 dependencies:

test/widgets/editor_test.dart

@@ -3,7 +3,6 @@ import 'dart:convert' show jsonDecode;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_quill/flutter_quill.dart';
-import 'package:flutter_quill/src/widgets/raw_editor/raw_editor_state.dart';
 import 'package:flutter_quill_test/flutter_quill_test.dart';
 import 'package:flutter_test/flutter_test.dart';