Roll Dart SDK from 1abc88ed0800 to 4f40923fc27d (1 revision) (flutter/engine#31038)

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': '1abc88ed08006a411713ee59d262bfedbdcb3974',
+  'dart_revision': '4f40923fc27d58d2deffae0b8a07db8d3359aa8a',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -349,7 +349,7 @@ deps = {
    Var('dart_git') + '/dart_style.git@6f894c0ca33686122be9085f06e5b9bf6ad55262',
 
   'src/third_party/dart/third_party/pkg_tested/package_config':
-   Var('dart_git') + '/package_config.git@fb736aa12316dd2d882b202a438a6946a4b4bea0',
+   Var('dart_git') + '/package_config.git@8731bf10b5375542792a32a0f7c8a6f370583d96',
 
   'src/third_party/dart/tools/sdks':
    {'packages': [{'version': 'version:2.15.1', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},