Roll Dart SDK from 13b3f2d7b6ea to 4fb134a228c7 (2 revisions) (#21419)

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': '13b3f2d7b6ea232619c1243373074b974c7a7e76',
+  'dart_revision': '4fb134a228c76c6b4e5a8700340c6c54022ea7ec',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -59,7 +59,7 @@ vars = {
   'dart_shelf_static_rev': 'v0.2.8',
   'dart_shelf_web_socket_tag': '0.2.2+3',
   'dart_sse_tag': 'e5cf68975e8e87171a3dc297577aa073454a91dc',
-  'dart_stack_trace_tag': 'd3813ca0a77348e0faf0d6af0cc17913e36afa39',
+  'dart_stack_trace_tag': 'a958966148516dfa64e2b54c14492175da5cc8e1',
   'dart_stagehand_tag': 'v3.3.9',
   'dart_stream_channel_tag': 'c446774fd077c9bdbd6235a7aadc661ef60a9727',
   'dart_test_reflective_loader_tag': '0.1.9',

ci/licenses_golden/licenses_third_party

-Signature: 0fadc3e075f6a5f21b22ffd2b3db046b
+Signature: 6cffd19e8a014087118240e7ee836c22
 
 UNUSED LICENSES: