fix: replace deprecated MessageUniquePtr to std::unique_ptr<MessageT>

Signed-off-by: homalozoa <nx.tardis@gmail.com>

diagnostic_updater/include/diagnostic_updater/publisher.hpp

@@ -242,7 +242,7 @@ class DiagnosedPublisher : public TopicDiagnostic
    * The timestamp to be used by the TimeStampStatus class will be
    * extracted from message.header.stamp.
    */
-  virtual void publish(typename PublisherT::MessageUniquePtr message)
+  virtual void publish(std::unique_ptr<MessageT> message)
   {
     tick(message->header.stamp);
     publisher_->publish(std::move(message));