Roll Dart SDK from f38618d5d0c0 to 05febe0a7860 (5 revisions) (#29539)

https://dart.googlesource.com/sdk.git/+log/f38618d5d0c0..05febe0a7860

2021-11-03 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.15.0-280.0.dev
2021-11-03 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.15.0-279.0.dev
2021-11-02 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.15.0-278.0.dev
2021-11-02 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.15.0-277.0.dev
2021-11-02 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.15.0-276.0.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 bdero@google.com,dart-vm-team@google.com,asiva@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://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

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': 'f38618d5d0c0a1098bc518bb74ea9df248b09963',
+  'dart_revision': '05febe0a78600b8a68bcf5999d20dc8c35c59aa3',
 
   # 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: e3d028e6a9acd048c14adc29bb110683
+Signature: 422f2baa63930fddb23c6684ac2607d7
 
 UNUSED LICENSES: