Roll Dart SDK from add161c68e6d to 5084fdc1d98a (1 revision) (#49399)

https://dart.googlesource.com/sdk.git/+log/add161c68e6d..5084fdc1d98a

2023-12-27 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.3.0-262.0.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

@@ -66,7 +66,7 @@ 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': 'add161c68e6debf0962d32e6e19217274d76546f',
+  'dart_revision': '5084fdc1d98ac38d3d3c381c768ba1021a9fc501',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py