Roll Dart SDK from e5b2cb0 to acb552d (1 revision) (#18817)

Author: skia-flutter-autoroll

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'e5b2cb0b02aef4389f66f6076de43f211e732e0b',
+  'dart_revision': 'acb552d056be6996314c5e984993da573ddf3df7',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py