message: cleanup: use structured binding
diff: @@ -44,8 +44,8 @@ void CdsApiImpl::onConfigUpdate(const std::vector<Config::DecodedResourceRef>& r
  clusters_to_remove.erase(resource.get().name());
  }
  Protobuf::RepeatedPtrField<std::string> to_remove_repeated;
  - for (const auto& cluster : clusters_to_remove) {
  - *to_remove_repeated.Add() = cluster.first;
  + for (const auto& [cluster_name, _] : clusters_to_remove) {
  + *to_remove_repeated.Add() = cluster_name;
  }
  onConfigUpdate(resources, to_remove_repeated, version_info);
  }
  