Perform PUT /rooms/$room_id/state/m.room.topic
        Args:
            room_id (str): The room ID
            topic (str): The new room topic
            timestamp (int): Set origin_server_ts (For application services only)

def set_room_topic(self, room_id, topic, timestamp=None):
        """Perform PUT /rooms/$room_id/state/m.room.topic
        Args:
            room_id (str): The room ID
            topic (str): The new room topic
            timestamp (int): Set origin_server_ts (For application services only)
        """
        body = {
            "topic": topic
        }
        return self.send_state_event(room_id, "m.room.topic", body, timestamp=timestamp)