Roll Dart SDK from a9e67d81941a to fecc8163afc7 (3 revisions) (#19703)

DEPS

@@ -34,7 +34,7 @@ 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': 'a9e67d81941a085ba6b8d0a2fe959c47e5a8b3a2',
+  'dart_revision': 'fecc8163afc76f6accd461d59a7eb82fe4215d61',
 
   # 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

-Signature: eaf762d66a3a573b9e66d12567037022
+Signature: fa08cd450f2fed76fcac6a8f32293511
 
 UNUSED LICENSES: