Roll Dart SDK from 34cd2b4b56dd to c7518d480c73 (1 revision) (flutter#175049)

https://dart.googlesource.com/sdk.git/+log/34cd2b4b56dd..c7518d480c73

2025-09-08 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.10.0-180.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
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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': '34cd2b4b56ddba2a34f0ee110c6f8fde032968ba',
+  'dart_revision': 'c7518d480c736956ae21447b6d84157693639f7b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py