Roll Dart SDK from e283a9e88242 to a0e39d9b4a58 (1 revision) (flutter#174383)

https://dart.googlesource.com/sdk.git/+log/e283a9e88242..a0e39d9b4a58

2025-08-25 [email protected]
Version 3.10.0-136.0.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
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ensure that a human
is aware of the problem.

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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': 'e283a9e8824254a9cd1ac8748e76e124b795179b',
+  'dart_revision': 'a0e39d9b4a58f0c179753880bc35e54e3aba00d6',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py