Roll Dart SDK from c32f12ffbef2 to a7d1f804fa27 (1 revision) (#37873)

https://dart.googlesource.com/sdk.git/+log/c32f12ffbef2..a7d1f804fa27

2022-11-23 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 2.19.0-424.0.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,kaushikiska@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
diff --git a/DEPS b/DEPS
index 0664cda..70e96bb 100644
--- a/DEPS
+++ b/DEPS
@@ -48,7 +48,7 @@
   # 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': 'c32f12ffbef2307bf298f7d601d21764a6f12ff1',
+  'dart_revision': 'a7d1f804fa274d6c09d284210e6ca754f222a31f',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index 4092587..af3c50f 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 986daabad840b2ccdeff5e01886ff5b5
+Signature: e6a35b6febfdb6be4b0ceb95571663b1
 
 UNUSED LICENSES: