Fix literal import

Author: dstansby

src/zarr/group.py

@@ -5,10 +5,13 @@
 import logging
 from collections.abc import Iterator
 from dataclasses import asdict, dataclass, field, replace
-from typing import TYPE_CHECKING, cast, overload
+from typing import TYPE_CHECKING, Literal, cast, overload
 
 import numpy.typing as npt
 
+if TYPE_CHECKING:
+    from collections.abc import AsyncGenerator, Iterable
+    from typing import Any
 from zarr.abc.codec import Codec
 from zarr.abc.metadata import Metadata
 from zarr.abc.store import set_or_delete