Roll Dart SDK from 207232b5abe0 to 87a4768078b2 (5 revisions) (#27476)

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': '207232b5abe0e8ca48ba936918fa6a17cbf2ae79',
+  'dart_revision': '87a4768078b2a1709a8943b3167f73614e357a60',
 
   # 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: 01ab9ad369fce43ec63db151000996d3
+Signature: 3f786bb42d40dba410a7ea283de8ae32
 
 UNUSED LICENSES: