Roll Dart SDK from 5bd3e5a63f1b to 2060964faaf6 (9 revisions) (#20346)

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': '5bd3e5a63f1b9c8257e2e6397d2a008772a27ebd',
+  'dart_revision': '2060964faaf6ee6cd719a188ac95a85e88622290',
 
   # 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: d2843695e11c14d932bf55cdcbfb151d
+Signature: c77ced51ed59ad5870d30d643ab92d00
 
 UNUSED LICENSES: