Roll Dart SDK from 12c5be745bb5 to 92e087bf82e2 (1 revision) (#22531)

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': '12c5be745bb5d3a0f4fa5edc76b2269641860654',
+  'dart_revision': '92e087bf82e261cd12bb62b53626c6527cd28091',
 
   # 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: 5a4a08bda10ca49776a3a75c8f205654
+Signature: cda1b2cb7c6a10abbca06aecedba35ea
 
 UNUSED LICENSES: