update dart hash to stable 3.32 (flutter#168927)

Align stable with stable dart hash. 

I did run gclient sync then engine/src/tools/dart/create_updated_flutter_deps.py but nothing changed.

Author: reidbaker

DEPS

@@ -56,7 +56,7 @@ 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': 'e7f2f0556e3e57acb60749467e54f9a44b2bfc76',
+  'dart_revision': 'b04011c77cd93e6ab9144af37976733b558d716c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py