fix: remove unused qi import

It had already been made so that the VideoSender does not depend on `qi`, but the import was not yet removed.

ref: N25B-119

src/robot_interface/endpoints/video_sender.py

@@ -1,6 +1,5 @@
 import zmq
 import threading
-import qi
 import logging
 
 from robot_interface.endpoints.socket_base import SocketBase