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

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Author: pre-commit-ci[bot]

monai/transforms/io/array.py

@@ -43,7 +43,6 @@
 from monai.data.utils import is_no_channel
 from monai.transforms.transform import Transform
 from monai.transforms.utility.array import EnsureChannelFirst
-from monai.utils import ImageMetaKey as Key
 from monai.utils import (
     GridSamplePadMode,
     ImageMetaKey,