Roll Dart SDK from 6171198 to 5422228 (1 revision) (#31864)

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': '6171198cb639bf037cfd6fe1ed91dfb00132f0a4',
+  'dart_revision': '5422228147cd8bf4b92ec2404b15e52520ed9943',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py