[package:vm_service] Fix wildcard_test

Fixes: #56868
Change-Id: Ie1ae0ad6f872fe7f4fc330d7e4c564ac10804d52
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/388880
Reviewed-by: Ben Konyi <[email protected]>
Commit-Queue: Derek Xu <[email protected]>

Author: derekxu16

pkg/vm_service/test/wildcard_test.dart

@@ -5,7 +5,7 @@
 // SharedOptions=--enable-experiment=wildcard-variables
 
 // ignore: invalid_language_version_override
-// @dart = 3.6
+// @dart = 3.7
 
 import 'dart:developer';
 // Tests wildcard import prefixes.