[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

xarray/core/groupers.py

@@ -10,7 +10,6 @@
 from abc import ABC, abstractmethod
 from collections.abc import Mapping, Sequence
 from dataclasses import dataclass, field
-from typing import Any
 
 import numpy as np
 import pandas as pd