Roll Dart SDK from 5646ac9669f8 to 838cd732e56a (3 revisions) (#49982)

https://dart.googlesource.com/sdk.git/+log/5646ac9669f8..838cd732e56a

2024-01-23 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-63.0.dev
2024-01-23 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-62.0.dev
2024-01-23 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-61.0.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 dart-vm-team@google.com,jacksongardner@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

@@ -65,7 +65,7 @@ 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': '5646ac9669f8b8b15651979875f9a8b8e6acc857',
+  'dart_revision': '838cd732e56a316b5e43e3a269dd154d103cd8fb',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -374,7 +374,7 @@ deps = {
    Var('dart_git') + '/dart_style.git@8b1f24a8475a0116757172cd9acca4acbf87d973',
 
   'src/third_party/dart/third_party/pkg/dartdoc':
-   Var('dart_git') + '/dartdoc.git@b04c9c127fea5f3fdf600aa205f50d81d1c779c5',
+   Var('dart_git') + '/dartdoc.git@49d48d7749f48e2d9930ffda5bcde1e692ffce31',
 
   'src/third_party/dart/third_party/pkg/ffi':
    Var('dart_git') + '/ffi.git@c926657618443ff4821411ede01684096b503f84',
@@ -413,7 +413,7 @@ deps = {
    Var('dart_git') + '/logging.git@4d35a4e02b9237bd794378413e7ce3deb52ffcaf',
 
   'src/third_party/dart/third_party/pkg/markdown':
-   Var('dart_git') + '/markdown.git@7602f9f17d25702c11991380ebc7853ccdc42f7a',
+   Var('dart_git') + '/markdown.git@a8288ca3a3023228f1a8a832b78d00e11f0c4b30',
 
   'src/third_party/dart/third_party/pkg/matcher':
    Var('dart_git') + '/matcher.git@d9cf4f69e3f557718ab5be042dd5503afcacac51',

ci/licenses_golden/licenses_dart

@@ -1,4 +1,4 @@
-Signature: bfe079de7a6c5c5c2ce1f7e9837a17ac
+Signature: 220eff93209db1e438758278dd1292c0
 
 ====================================================================================================
 LIBRARY: dart
@@ -4705,7 +4705,7 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   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/+/5646ac9669f8b8b15651979875f9a8b8e6acc857
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/838cd732e56a316b5e43e3a269dd154d103cd8fb
 /third_party/fallback_root_certificates/
 
 ====================================================================================================

sky/packages/sky_engine/LICENSE

@@ -31236,7 +31236,7 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   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/+/5646ac9669f8b8b15651979875f9a8b8e6acc857
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/838cd732e56a316b5e43e3a269dd154d103cd8fb
 /third_party/fallback_root_certificates/
 
 --------------------------------------------------------------------------------