[flutter_releases] Flutter beta 3.27.0-0.2.pre Engine Cherrypicks (#56583)

# Flutter beta 3.27.0-0.2.pre Engine

## Scheduled Cherrypicks

- Roll dart revision: dart-lang/sdk@847db142d

DEPS

diff --git a/DEPS b/DEPS
index 69be7a3..23ab816 100644
--- a/DEPS
+++ b/DEPS
@@ -56,7 +56,7 @@
   # 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': 'e7a42fbc90c14c2d2eb1c00d132de202018d3777',
+  'dart_revision': '847db142d385db9e561e68f20f4eb849466b0007',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py