Roll Dart SDK from 55d7c1b35902 to 452c6617ee36 (1 revision) (flutter/engine#44675)

https://dart.googlesource.com/sdk.git/+log/55d7c1b35902..452c6617ee36

2023-08-14 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.2.0-66.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC chinmaygarde@google.com,dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

DEPS

@@ -53,7 +53,7 @@ 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': '55d7c1b35902e561f91860229fdac0a0e77450d5',
+  'dart_revision': '452c6617ee3616c8498b83bb4b27fef5f82bc3bc',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

engine/src/flutter/ci/licenses_golden/licenses_dart

@@ -1,4 +1,4 @@
-Signature: eb7ca45ac8d14a4cd0b3fc214b80a0f9
+Signature: d251396b2bff525b4027ef0c9d8f0307
 
 ====================================================================================================
 LIBRARY: dart