Roll Dart SDK from 118e061bef8a to 444f455adb86 (2 revisions) (flutter#32558)

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': '118e061bef8a2b7363005eda4202ab8505e3e261',
+  'dart_revision': '444f455adb86aca42348f68c947cefd371261020',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py