Roll Dart SDK from fdd90f38d6a0 to 0009748aed50 (3 revisions) (#176461)

https://dart.googlesource.com/sdk.git/+log/fdd90f38d6a0..0009748aed50

2025-10-03 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-278.0.dev
2025-10-03 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-277.0.dev
2025-10-03 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-276.0.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
Please CC dart-vm-team@google.com,jimgraham@google.com on the revert to
ensure that a human
is aware of the problem.

To file a bug in Flutter:
https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
diff --git a/DEPS b/DEPS
index 2d7d992..7232f6c 100644
--- a/DEPS
+++ b/DEPS
@@ -56,7 +56,7 @@
   # 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': 'fdd90f38d6a0f2115891346b9baa3d10f9a66d32',
+  'dart_revision': '0009748aed5088a399c1e1929d7a440f96c2164c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py