Update dependency dart to v3

renovate[bot] · web-flow · commit bca5790f99c7 · 2023-08-25T05:44:03.000Z
diff --git a/pubspec.yaml b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '<4.0.0'
 
 dependencies:
   flutter:
