Roll Dart SDK from 042dbc146a37 to d6c08fa9bb54 (2 revisions) (#49763)

https://dart.googlesource.com/sdk.git/+log/042dbc146a37..d6c08fa9bb54

2024-01-12 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-24.0.dev
2024-01-12 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-23.0.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 bdero@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
diff --git a/DEPS b/DEPS
index 6b83481..2f3ce9c 100644
--- a/DEPS
+++ b/DEPS
@@ -65,7 +65,7 @@
   # 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': '042dbc146a379200c79fb7102acbab1ddf052777',
+  'dart_revision': 'd6c08fa9bb54dfc52e32ee879ae157f8a01d5a50',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_dart b/ci/licenses_golden/licenses_dart
index 672ee15..1c312d3 100644
--- a/ci/licenses_golden/licenses_dart
+++ b/ci/licenses_golden/licenses_dart
@@ -1,4 +1,4 @@
-Signature: 91379d4b3b3965715a49904f6ff4f7c6
+Signature: 60ebc270fcd5313847ed98c6ce909e6a
 
 ====================================================================================================
 LIBRARY: dart
@@ -4707,7 +4707,7 @@
   This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.
 
-You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/f61f7d2f57c597247cea1f99441b4017c6a4fa7b
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/d6c08fa9bb54dfc52e32ee879ae157f8a01d5a50
 /third_party/fallback_root_certificates/
 
 ====================================================================================================
diff --git a/sky/packages/sky_engine/LICENSE b/sky/packages/sky_engine/LICENSE
index 56a5419..17a70fe 100644
--- a/sky/packages/sky_engine/LICENSE
+++ b/sky/packages/sky_engine/LICENSE
@@ -31204,7 +31204,7 @@
   This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.
 
-You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/042dbc146a379200c79fb7102acbab1ddf052777
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/d6c08fa9bb54dfc52e32ee879ae157f8a01d5a50
 /third_party/fallback_root_certificates/
 
 --------------------------------------------------------------------------------