Roll Dart SDK from 11efe37089a7 to 75899721aa42 (2 revisions) (flutter#179573)

https://dart.googlesource.com/sdk.git/+log/11efe37089a7..75899721aa42

2025-12-08 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.11.0-220.0.dev
2025-12-08 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.11.0-219.0.dev

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Author: engine-flutter-autoroll

DEPS

@@ -59,7 +59,7 @@ vars = {
   # updated revision list of existing dependencies. You will need to
   # gclient sync before and after update deps to ensure all deps are updated.
   # updated revision list of existing dependencies.
-  'dart_revision': '11efe37089a792de660ab75c27087055c89eb5dd',
+  'dart_revision': '75899721aa4267b5c3b6f81d94e1e72e20391955',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py