[flutter_releases] Flutter stable 3.19.0 Engine Cherrypicks (#50618)

# Flutter stable 3.19.0 Engine

## Scheduled Cherrypicks

- Roll dart revision: dart-lang/sdk@25b3f65bf

DEPS

@@ -66,7 +66,7 @@ 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': 'fe4b8016416d22afe75d8225f0c3f753b089c0b1',
+  'dart_revision': '25b3f65bf6264df5bd7cd6aca25cb68d47b9348b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py