fix linter

uvicorn/loops/asyncio.py

@@ -1,14 +1,8 @@
 from __future__ import annotations
 
 import asyncio
-import logging
 import sys
 from collections.abc import Callable
-from typing import TypeVar
-
-_T = TypeVar("_T")
-
-logger = logging.getLogger("uvicorn.error")
 
 
 def asyncio_loop_factory(use_subprocess: bool = False) -> Callable[[], asyncio.AbstractEventLoop]: