[flutter_releases] Flutter Stable 2.0.5 Engine Cherrypicks (#25619)

* Roll Dart SDK 2.12.3
* update licenses golden

DEPS

@@ -35,7 +35,7 @@ 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': '65376c07234d1df472662d21dff2498ab2d3cdda',
+  'dart_revision': '7c8c6b3053d0ba91fcf15f81c45650184dc27e88',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: 890d97116d1c4d016c71fa50db974d98
+Signature: 5c79cd2b2923476fb5c2db8b6fa7b779
 
 UNUSED LICENSES: