Updating samples Dart sdk to the last stable version (#2209)

web/_packages/web_startup_analyzer/example/pubspec.yaml

@@ -3,7 +3,7 @@ description: "flutter_web_startup_analyzer example"
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 environment:
-  sdk: ^3.2.0
+  sdk: ^3.3.1
   flutter: ^3.16.0
 dependencies:
   flutter:

web/_packages/web_startup_analyzer/pubspec.yaml

@@ -3,7 +3,7 @@ description: "Captures web startup timing data in a Flutter web app"
 version: 0.1.0-wip
 
 environment:
-  sdk: ^3.2.0
+  sdk: ^3.3.1
   flutter: ^3.16.0
 
 dependencies:

web/_tool/pubspec.yaml

@@ -2,7 +2,7 @@ name: tool
 publish_to: none
 
 environment:
-  sdk: ^3.2.0
+  sdk: ^3.3.1
 
 dependencies:
   markdown: ^7.0.0

web/samples_index/pubspec.yaml

@@ -5,7 +5,7 @@ version: 0.0.1
 publish_to: none
 
 environment:
-  sdk: ^3.2.0
+  sdk: ^3.3.1
 
 dependencies:
   checked_yaml: ^2.0.3