Update dart.yml

Author: Jason-chen-coder

.github/workflows/dart.yml

@@ -14,8 +14,10 @@ jobs:
       # 检出代码
       - uses: actions/checkout@v4
 
-      # 设置 Dart/Flutter 环境
-      - uses: dart-lang/setup-dart@9a04e6d73cca37bd455e0608d7e5092f881fd603
+      # 设置 Flutter 环境
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "stable"
 
       # 安装依赖项
       - name: Install dependencies