fix ruff checks

Author: typester

livekit-rtc/livekit/rtc/audio_filter.py

@@ -1,4 +1,3 @@
-import json
 from typing import Optional, List
 
 from ._ffi_client import FfiClient, FfiHandle

livekit-rtc/livekit/rtc/room.py

@@ -17,7 +17,7 @@
 import ctypes
 import logging
 from dataclasses import dataclass, field
-from typing import Callable, Dict, Literal, Optional, cast, Mapping, List, Any
+from typing import Callable, Dict, Literal, Optional, cast, Mapping, List
 from types import ModuleType
 
 from .event_emitter import EventEmitter

livekit-rtc/livekit/rtc/track.py

@@ -21,7 +21,6 @@
 if TYPE_CHECKING:
     from .audio_source import AudioSource
     from .video_source import VideoSource
-    from .room import Room
 
 
 class Track: