Roll Dart SDK from 23dd69705479 to 46934d8475ff (1 revision) (flutter#29763)

Author: skia-flutter-autoroll

DEPS

@@ -39,7 +39,7 @@ 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': '23dd6970547945e0308def083c915fce8965beed',
+  'dart_revision': '46934d8475ffbe904d3e67f14aac2701d4cf7ad2',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -356,7 +356,7 @@ deps = {
    Var('dart_git') + '/package_config.git@fb736aa12316dd2d882b202a438a6946a4b4bea0',
 
   'src/third_party/dart/tools/sdks':
-   {'packages': [{'version': 'version:2.15.0-82.0.dev', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'packages': [{'version': 'version:2.15.0-268.8.beta', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
 

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 7be1c4f3eda4c2905f5dadb8d56f40b6
+Signature: 4e6cf3e18cbf855ab32c65baecd06daa
 
 UNUSED LICENSES: