update vm_service to support 11.0.0 (#1910)

Author: Daniel Chevalier

pkgs/test_core/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * Avoid empty expandable groups for tests without extra output in Github
   reporter.
+* Update `vm_service` constraint to `>=6.0.0 <12.0.0`.
 
 # 0.4.22
 

pkgs/test_core/pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   source_span: ^1.8.0
   stack_trace: ^1.10.0
   stream_channel: ^2.1.0
-  vm_service: ">=6.0.0 <11.0.0"
+  vm_service: ">=6.0.0 <12.0.0"
   yaml: ^3.0.0
   # matcher is tightly constrained by test_api
   matcher: any