Fix server SIGTERM handler signature

bmspy/server.py

@@ -15,6 +15,7 @@ import re
 import struct
 import serial
 from dataclasses import asdict as dataclass_asdict, dataclass
+from types import FrameType
 from typing import Any, NoReturn
 
 from bmspy.utilities import debugger
@@ -52,7 +53,7 @@ class DeviceState:
 connected_clients = list()
 
 
-def signalHandler() -> NoReturn:
+def signalHandler(signum: int, frame: FrameType | None) -> NoReturn:
     raise SystemExit("terminating")