Raise SDK dependency due to importModule change

Author: simolus3

pkgs/test/pubspec.yaml

@@ -6,7 +6,7 @@ repository: https://github.com/dart-lang/test/tree/master/pkgs/test
 resolution: workspace
 
 environment:
-  sdk: ^3.5.0-259.0.dev
+  sdk: ^3.5.0-300.0.dev
 
 dependencies:
   analyzer: '>=5.12.0 <7.0.0'