Roll Dart SDK from 29d9805 to 3bfae48 (1 revision) (#35390)

Author: skia-flutter-autoroll

DEPS

@@ -36,7 +36,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '29d9805d57e51308d217148bf98d103eea657552',
+  'dart_revision': '3bfae4864b82819cbfa184db1c7996ad4cef91f1',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py