Update the package:vm_service constraint to allow version 14.x (#2157)

Author: derekxu16

pkgs/test_core/CHANGELOG.md

@@ -10,6 +10,7 @@
   libraries in the package.
 * Update the `package:frontend_server_client` constraint to allow version
   `4.0.0`.
+* Update the `package:vm_service` constraint to allow version `14.x`.
 
 ## 0.5.9
 

pkgs/test_core/pubspec.yaml

@@ -27,7 +27,7 @@ dependencies:
   stream_channel: ^2.1.0
   # Use an exact version until the test_api package is stable.
   test_api: 0.7.0
-  vm_service: ">=6.0.0 <14.0.0"
+  vm_service: ">=6.0.0 <15.0.0"
   yaml: ^3.0.0
 
 dev_dependencies: