Roll Dart SDK from 8fe983db0c99 to 2ef8f57989c2 (6 revisions) (#181018)

https://dart.googlesource.com/sdk.git/+log/8fe983db0c99..2ef8f57989c2

2026-01-15 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-29.0.dev
2026-01-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-28.0.dev
2026-01-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-27.0.dev
2026-01-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-26.0.dev
2026-01-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-25.0.dev
2026-01-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.12.0-24.0.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
Please CC dart-vm-team@google.com,jimgraham@google.com on the revert to
ensure that a human
is aware of the problem.

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Author: engine-flutter-autoroll

DEPS

@@ -59,7 +59,7 @@ vars = {
   # updated revision list of existing dependencies. You will need to
   # gclient sync before and after update deps to ensure all deps are updated.
   # updated revision list of existing dependencies.
-  'dart_revision': '8fe983db0c99ff206297113fdb790856aeabb79c',
+  'dart_revision': '2ef8f57989c253221a378d31dd166894afce6658',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -332,7 +332,7 @@ deps = {
    Var('dart_git') + '/leak_tracker.git@f5620600a5ce1c44f65ddaa02001e200b096e14c',
 
   'engine/src/flutter/third_party/dart/third_party/pkg/native':
-   Var('dart_git') + '/native.git@4bed1ed249b22f9a447b96bcaf4b546ce0e70319',
+   Var('dart_git') + '/native.git@c4f419cfc091aaa7bc7ce9e84ac49bc752e87b02',
 
   'engine/src/flutter/third_party/dart/third_party/pkg/protobuf':
    Var('dart_git') + '/protobuf.git' + '@' + Var('dart_protobuf_rev'),