Roll Dart SDK from e6bf503b36fe to 80b9a90ae563 (2 revisions) (flutter/engine#44753)

https://dart.googlesource.com/sdk.git/+log/e6bf503b36fe..80b9a90ae563

2023-08-16 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.2.0-76.0.dev
2023-08-16 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.2.0-75.0.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,jsimmons@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': 'e6bf503b36fe25b6e92cf5798ddf90b8f3db1d5a',
+  'dart_revision': '80b9a90ae563decb84d1e62d571f37491c7e480e',
 
   # 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: c77c216257529ead6f2cdbd70c3daaac
+Signature: e41fe2a877851fb5eb79096e75cd76cf
 
 ====================================================================================================
 LIBRARY: dart