Roll Dart SDK from 859e9bb to 691aa62 (1 revision)

https://dart.googlesource.com/sdk.git/+log/859e9bbe6f0a..691aa6246705

2022-08-24 dart-internal-sdk-dev-roller@dart-ci-internal.iam.gserviceaccount.com Version 2.19.0-134.0.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 [email protected],[email protected] 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

Author: skia-flutter-autoroll

DEPS

@@ -36,7 +36,7 @@ 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': '859e9bbe6f0ad5c1a6bff4ee1d854eb3fd0a3da7',
+  'dart_revision': '691aa6246705eb9604f291434444b6c83373f2a5',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py