update flutter version

.fvm/fvm_config.json

@@ -1,4 +1,4 @@
 {
-  "flutterSdkVersion": "2.2.0",
+  "flutterSdkVersion": "2.8.1",
   "flavors": {}
 }

pubspec.lock

@@ -56,7 +56,7 @@ packages:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.6.1"
+    version: "2.8.2"
   auto_size_text:
     dependency: transitive
     description:
@@ -161,14 +161,14 @@ packages:
       name: characters
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   checked_yaml:
     dependency: transitive
     description:
@@ -589,14 +589,14 @@ packages:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.10"
+    version: "0.12.11"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0"
+    version: "1.7.0"
   mime:
     dependency: transitive
     description:
@@ -909,7 +909,7 @@ packages:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.3.0"
+    version: "0.4.3"
   timing:
     dependency: transitive
     description:
@@ -979,7 +979,7 @@ packages:
       name: vector_math
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   velocity_x:
     dependency: "direct main"
     description:
@@ -1037,5 +1037,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.14.0 <3.0.0"
   flutter: ">=2.0.0"