Roll Dart SDK from fd72dbb5b82b to 5e24a66b1bb8 (1 revision) (#23828)

https://dart.googlesource.com/sdk.git/+log/fd72dbb5b82b..5e24a66b1bb8

2021-01-21 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-248.0.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 on the revert to ensure that a human
is aware of the problem.

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/master/autoroll/README.md
diff --git a/DEPS b/DEPS
index 4f099b4..32e7492 100644
--- a/DEPS
+++ b/DEPS
@@ -35,7 +35,7 @@
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'fd72dbb5b82ba4d3f857610bc62a9bf34537301a',
+  'dart_revision': '5e24a66b1bb8ed90a3ebb0f6558f6181427023c8',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py