fix linter

Author: slampy97

ydb/aio/coordination/client.py

@@ -1,4 +1,3 @@
-import asyncio
 from typing import Optional
 
 from ydb._grpc.grpcwrapper.ydb_coordination import (

ydb/aio/coordination/stream.py

@@ -2,6 +2,7 @@
 import contextlib
 from typing import Set, Optional
 
+import ydb
 from ydb import issues, _apis
 from ydb._grpc.grpcwrapper.ydb_coordination import FromServer, Ping, SessionStart