fix pre-commit

Author: kylebarron

src/zarr/testing/store.py

@@ -5,7 +5,7 @@
 from abc import abstractmethod
 from typing import TYPE_CHECKING, Generic, TypeVar
 
-from zarr.storage import ObjectStore, WrapperStore
+from zarr.storage import WrapperStore
 
 if TYPE_CHECKING:
     from typing import Any