Roll Dart SDK from d4eafe508129 to a9cf6a411c71 (1 revision)

https://dart.googlesource.com/sdk.git/+log/d4eafe508129..a9cf6a411c71

2024-05-03 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.5.0-131.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC aaclarke@google.com,dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -56,7 +56,7 @@ 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': 'd4eafe5081296cfd7679501a0b43d97eff603f7a',
+  'dart_revision': 'a9cf6a411c717916c4a170fcf7f6836a93a8ea04',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py