Roll Dart SDK from 902538ea56d5 to fc82eeed7df3 (1 revision) (#21981)

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': '902538ea56d5058c901a872415e148e644c46c40',
+  'dart_revision': 'fc82eeed7df32eb6061cb0662b7c200e88f48e1c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py