Fix type annotation for DataVariables to use Hashable instead of Any (#10960)

Co-authored-by: DHRUVA KUMAR KAUSHAL <sanjay@MacBook-Air.local>

Author: dhruvak001

xarray/core/dataset_variables.py

@@ -1,6 +1,5 @@
 import typing
 from collections.abc import Hashable, Iterator, Mapping
-from typing import Any
 
 import numpy as np
 
@@ -13,7 +12,7 @@
     from xarray.core.dataset import Dataset
 
 
-class DataVariables(Mapping[Any, "DataArray"]):
+class DataVariables(Mapping[Hashable, "DataArray"]):
     __slots__ = ("_dataset",)
 
     def __init__(self, dataset: "Dataset"):