Update dependency dart to v3

renovate[bot] · web-flow · commit 25b2827c9d9b · 2023-08-23T09:02:12.000Z
diff --git a/pubspec.yaml b/pubspec.yaml
@@ -5,7 +5,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '<4.0.0'
 
 dependencies:
   flutter:
