update vm_service_client to 0.2.2+4 (#6917)

dev/devicelab/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   meta: ^1.0.3
   path: ^1.3.0
   stack_trace: ^1.4.0
-  vm_service_client: '0.2.2+2' # TODO(yegor): use the latest version
+  vm_service_client: '0.2.2+4'
 
 dev_dependencies:
   # See packages/flutter_test/pubspec.yaml for why we're pinning this version.

packages/flutter_driver/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
   matcher: '>=0.12.0 <1.0.0'
   path: '^1.3.0'
   web_socket_channel: '^1.0.0'
-  vm_service_client: '0.2.2+2' # TODO(yegor): use the latest version
+  vm_service_client: '0.2.2+4'
   flutter:
     sdk: flutter
   flutter_test:

packages/flutter_tools/pubspec.yaml

@@ -24,7 +24,7 @@ dependencies:
   pub_semver: ^1.0.0
   stack_trace: ^1.4.0
   usage: ^2.2.1
-  vm_service_client: '0.2.2+2' # TODO(yegor): use the latest version
+  vm_service_client: '0.2.2+4'
   web_socket_channel: ^1.0.4
   xml: ^2.4.1
   yaml: ^2.1.3