Roll Dart SDK from 56cc05dd11a8 to 51fe8cd01fbe (1 revision) (flutter#179257)

https://dart.googlesource.com/sdk.git/+log/56cc05dd11a8..51fe8cd01fbe

2025-12-01 [email protected]
Version 3.11.0-189.0.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 [email protected],[email protected] on the revert
to ensure that a human
is aware of the problem.

To file a bug in Flutter:
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: 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': '56cc05dd11a8a94be71210af8f2f231b645a9509',
+  'dart_revision': '51fe8cd01fbed57699151e6b443c87a84e6d818a',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py