Roll Dart SDK from 67ca79475db6 to a874859559e6 (2 revisions) (flutter#173922)

https://dart.googlesource.com/sdk.git/+log/67ca79475db6..a874859559e6

2025-08-17 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-106.0.dev
2025-08-16 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-105.0.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 chinmaygarde@google.com,dart-vm-team@google.com on the revert
to ensure that a human
is aware of the problem.

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https://github.com/flutter/flutter/issues/new/choose

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Author: engine-flutter-autoroll

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': '67ca79475db612356bf11cbca5effa2ebebd1f75',
+  'dart_revision': 'a874859559e6f09f65e0ed9e5af3375030c35e87',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py