Revert Dart SDK to 2.19.0-429.0.dev (#37937)

* Revert "Roll Dart SDK from 962cd6e0d20a to ae7042bf53ff (1 revision) (#37904)"

This reverts commit 2f04c999661f35e09d38e801061d1db26c69a5c9.

* Revert "Roll Dart SDK from eddf73d66119 to 962cd6e0d20a (1 revision) (#37900)"

This reverts commit d15e1d5d4df96597611a9bfada52dd434b3db4b7.
diff --git a/DEPS b/DEPS
index a628a06..de306d1 100644
--- a/DEPS
+++ b/DEPS
@@ -48,7 +48,7 @@
   # 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': 'ae7042bf53ffda8492a80c3851c70dfadd497f69',
+  'dart_revision': 'eddf73d661193f21e8db15d6530d049498712f40',
 
   # 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 472ed3b..65e69ab 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 25df2f5233d08470c12a5689f24999cf
+Signature: e97a1e41f03fe9219f9b6066e1e67f5c
 
 UNUSED LICENSES: