Revert "Roll Dart SDK from 5a666e8d8259 to 38e8459ca2aa (4 revisions)" (#47459)

Reverts #47426

Failing to roll to the framework
https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20analyze/67482/overview

Author: zanderso

DEPS

@@ -57,7 +57,7 @@ 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': '38e8459ca2aa9be51745f261b21fde8ab7e5caad',
+  'dart_revision': '5a666e8d8259098182eb89ea48ac271e4efab751',
 
   # 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_dart

@@ -1,4 +1,4 @@
-Signature: d1bb16a91d8cfdd279257e15cc3032e4
+Signature: 022906f4ce02fdc2054c23c803c5cffe
 
 ====================================================================================================
 LIBRARY: dart