Roll Dart SDK from aab0233f76b7 to 1b85515a995b (1 revision) (flutter/engine#44096)

https://dart.googlesource.com/sdk.git/+log/aab0233f76b7..1b85515a995b

2023-07-28 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.2.0-11.0.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 dart-vm-team@google.com,jonahwilliams@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': 'aab0233f76b79cab344ae989998034e1742442c3',
+  'dart_revision': '1b85515a995b23c08faa9005b0e6b380064633e3',
 
   # 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: 631ae62e6259b05a5aa7c18a315b8a8f
+Signature: e4815157f6bdd7ef5b0750dfa5260795
 
 ====================================================================================================
 LIBRARY: dart