Roll Dart SDK from 73c34f2ad73f to 51035f288d30 (1 revision) (#24205)

diff --git a/DEPS b/DEPS
index ae1d889..7cc8736 100644
--- a/DEPS
+++ b/DEPS
@@ -35,7 +35,7 @@
   # 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': '73c34f2ad73f3d5e89680206a3beabb510be818c',
+  'dart_revision': '51035f288d30169dae8ba4a81d2fba377e76a77b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index ca70546..cc1864d 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 9be6541236c0a35c42dba40c6642bb6f
+Signature: 006f1e85df0f5a7c339107eecbe1a33a
 
 UNUSED LICENSES: