Add explicit dependencies so that google_composer_environment is cr…

…eated after IAM resources in acceptance test (GoogleCloudPlatform#9610)

mmv1/third_party/terraform/services/composer/resource_composer_environment_test.go.erb

@@ -2607,6 +2607,7 @@ resource "google_composer_environment" "test" {
       service_account = google_service_account.test.name
     }
   }
+  depends_on = [google_project_iam_member.composer-worker]
 }
 
 // use a separate network to avoid conflicts with other tests running in parallel
@@ -2682,6 +2683,7 @@ resource "google_composer_environment" "test" {
       service_account = google_service_account.test.name
     }
   }
+  depends_on = [google_project_iam_member.composer-worker]
 }
 
 // use a separate network to avoid conflicts with other tests running in parallel