code: def update(self, data):
          
          data = values.of({'Data': serialize.object(data), })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return SyncMapItemInstance(
              self._version,
              payload,
              service_sid=self._solution['service_sid'],
              map_sid=self._solution['map_sid'],
              key=self._solution['key'],
          )
docs: Update the SyncMapItemInstance
  
          :param dict data: The data
  
          :returns: Updated SyncMapItemInstance
          :rtype: twilio.rest.preview.sync.service.sync_map.sync_map_item.SyncMapItemInstance