output/PipeWire: use PW_KEY_TARGET_OBJECT with PipeWire 0.3.64

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1721

src/output/plugins/PipeWireOutputPlugin.cxx

@@ -523,7 +523,13 @@ PipeWireOutput::Open(AudioFormat &audio_format)
 		pw_properties_setf(props, PW_KEY_REMOTE_NAME, "%s", remote);
 
 	if (target != nullptr && target_id == PW_ID_ANY)
-		pw_properties_setf(props, PW_KEY_NODE_TARGET, "%s", target);
+		pw_properties_setf(props,
+#if PW_CHECK_VERSION(0, 3, 64)
+				   PW_KEY_TARGET_OBJECT,
+#else
+				   PW_KEY_NODE_TARGET,
+#endif
+				   "%s", target);
 
 #ifdef PW_KEY_NODE_RATE
 	/* ask PipeWire to change the graph sample rate to ours