Roll Dart SDK from f40875bf1b68 to 2b917f5b6a0e (10 revisions) (#18964)

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': 'f40875bf1b683c155f7e9ed2ffa662d21e721b5e',
+  'dart_revision': '2b917f5b6a0e1524516f214c6d0df49f4abfd378',
 
   # 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: c31f641e71533eef9fd3d50ea22f7dc5
+Signature: 007017b84ca8a56086f3cbb737e4c5eb
 
 UNUSED LICENSES: