Roll Dart SDK from c7042dc03f43 to c3afc3507b4f (1 revision) (flutter/engine#41458)

https://dart.googlesource.com/sdk.git/+log/c7042dc03f43..c3afc3507b4f

2023-04-24 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.1.0-38.0.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 aam@google.com,chinmaygarde@google.com,dart-vm-team@google.com,rmistry@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

@@ -47,7 +47,7 @@ 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': 'c7042dc03f43ef7329cc6ff6a04df90887873262',
+  'dart_revision': 'c3afc3507b4fe8457f4284f3d19e717b6d27e27b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py