Bump devtools_shared dependency to ^6.0.3

Change-Id: I611457fec4032e06cb5456020e884530e42f0b78
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/342720
Commit-Queue: Kenzie Davisson <kenzieschmoll@google.com>
Reviewed-by: Derek Xu <derekx@google.com>
diff --git a/pkg/dds/pubspec.yaml b/pkg/dds/pubspec.yaml
index 4bd1864..6a9a7cc 100644
--- a/pkg/dds/pubspec.yaml
+++ b/pkg/dds/pubspec.yaml
@@ -16,7 +16,7 @@
   dds_service_extensions: ^1.6.0
   dap: ^1.1.0
   extension_discovery: ^2.0.0
-  devtools_shared: ^6.0.0
+  devtools_shared: ^6.0.3
   http_multi_server: ^3.0.0
   json_rpc_2: ^3.0.0
   meta: ^1.1.8