[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/_channel.py

@@ -17,7 +17,7 @@
 import trio
 
 from ._abc import ReceiveChannel, ReceiveType, SendChannel, SendType, T
-from ._core import Abort, RaiseCancelT, Task, enable_ki_protection
+from ._core import Abort, Task, enable_ki_protection
 from ._util import (
     MultipleExceptionError,
     NoPublicConstructor,