Roll Dart SDK from ef8bf7f0a667 to 636ff0ec97e0 (1 revision) (#23639)

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': 'ef8bf7f0a6674eb3d5ff2fa28f812f2af10344fb',
+  'dart_revision': '636ff0ec97e04a45819e8591eaa8dfb8a0e49552',
 
   # 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: e6ef83d36fa60c97909585da2b86d099
+Signature: 1d2ff5f3ca7f8b5c5a9ed29f1665e5fb
 
 UNUSED LICENSES: