Roll Dart SDK from d464cd3 to 996ef24 (1 revision)

https://dart.googlesource.com/sdk.git/+log/d464cd3f2dc8..996ef242a2c9

2021-11-05 [email protected] Version 2.15.0-291.0.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 [email protected],[email protected] 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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -39,7 +39,7 @@ 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': 'd464cd3f2dc87073e16a094d8aca97829c73a0d8',
+  'dart_revision': '996ef242a2c9a345fd092461049644fa61378445',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: edcb031a1a0f92499de502c720e47961
+Signature: 788a2e507b09e2d4f2bf0e5453739616
 
 UNUSED LICENSES: