[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

src/trio/_threads.py

@@ -6,7 +6,7 @@
 import queue as stdlib_queue
 import threading
 from itertools import count
-from typing import TYPE_CHECKING, Generic, TypeVar, Protocol, Final, NoReturn
+from typing import TYPE_CHECKING, Final, Generic, NoReturn, Protocol, TypeVar
 
 import attrs
 import outcome