Roll Dart SDK from d174ec16c3ea to 4293d50dd30d (1 revision) (#166557)

https://dart.googlesource.com/sdk.git/+log/d174ec16c3ea..4293d50dd30d

2025-04-03 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.8.0-262.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
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ensure that a human
is aware of the problem.

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DEPS

@@ -56,7 +56,7 @@ 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': 'd174ec16c3eabc271d553d7fed29a106cafbd8df',
+  'dart_revision': '4293d50dd30d5469fac05af7470148977327bbe8',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py