Roll Dart SDK from 656201921b30 to ecc2440be198 (1 revision) (#43333)

https://dart.googlesource.com/sdk.git/+log/656201921b30..ecc2440be198

2023-06-29 [email protected]
Version 3.1.0-261.0.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

@@ -53,7 +53,7 @@ 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': '656201921b30accad521db032a336d83a8bf6874',
+  'dart_revision': 'ecc2440be1985d0a14b26e144176ba5c8c74d330',
 
   # 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: fa8fd542b5ac64e485dfd16acb28f3e5
+Signature: fec8a15c3745c41926800d91c23304ef
 
 ====================================================================================================
 LIBRARY: angle