Roll Dart SDK from ec71f6e to 231a9ea (4 revisions) (#33162)

Author: skia-flutter-autoroll

DEPS

@@ -45,7 +45,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'ec71f6e0cb080d1a09bebaeab3fb7baad52c09a9',
+  'dart_revision': '231a9ea32a5469c2ab4ad5f44a15e6bd29dc70df',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -255,7 +255,7 @@ deps = {
    Var('dart_git') + '/logging.git@dfbe88b890c3b4f7bc06da5a7b3b43e9e263b688',
 
   'src/third_party/dart/third_party/pkg/markdown':
-   Var('dart_git') + '/markdown.git@5699cafa9ef004875fd7de8ae9ea00e5295e87a4',
+   Var('dart_git') + '/markdown.git@7479783f0493f6717e1d7ae31cb37d39a91026b2',
 
   'src/third_party/dart/third_party/pkg/matcher':
    Var('dart_git') + '/matcher.git@07595a7739d47a8315caba5a8e58fb9ae3d81261',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 7b98064659dae3d6e229a2c751524f8d
+Signature: a8072eac7d6fe887bef75860f5eccbec
 
 UNUSED LICENSES: