Fix gRPC port

[dkzdragon02]

dkzdragon02@dkzdragon02:~/mavsdk_drone_show$ /bin/python3 /home/dkzdragon02/mavsdk_drone_show/offboard_multiple_from_csv.py
[DEBUG] Simulation Mode: True
[DEBUG] Configuration CSV: config_sitl.csv
[DEBUG] Swarm CSV: swarm_sitl.csv
2025-01-16 11:41:39 [DEBUG] asyncio: Using selector: EpollSelector
/home/dkzdragon02/mavsdk_drone_show/offboard_multiple_from_csv.py:973: DeprecationWarning: connections() is deprecated and will be removed; use net_connections() instead
for conn in proc.connections(kind='inet'):
2025-01-16 11:41:41 [DEBUG] main: Constructed MAVSDK server path: /home/dkzdragon02/.local/lib/python3.10/site-packages/mavsdk/bin/mavsdk_server
2025-01-16 11:41:41 [INFO] main: MAVSDK server started with gRPC port 50040 and UDP port 14540.
2025-01-16 11:41:51 [ERROR] main: MAVSDK server did not start listening on port 50040 within timeout.
2025-01-16 11:41:51 [ERROR] main: Failed to start MAVSDK server. Exiting program.