Roll Dart SDK from 4693d6d to f4b051e (2 revisions)

https://dart.googlesource.com/sdk.git/+log/4693d6d4f88e..f4b051ea1004

2021-03-05 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.13.0-109.0.dev
2021-03-05 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.13.0-108.0.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 on the revert to ensure that a human
is aware of the problem.

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/master/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -35,7 +35,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '4693d6d4f88e5e94ad9916e9d085514f7ff882e4',
+  'dart_revision': 'f4b051ea10049690d4715fb3dd99e6c730fdeb96',
 
   # 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: b5f00a9a7a489c85511d83863985c149
+Signature: 39723fd392cd51dc6f3d9c68fd390acb
 
 UNUSED LICENSES: