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

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Author: pre-commit-ci[bot]

monai/metrics/meandice.py

@@ -13,7 +13,6 @@
 
 import torch
 
-from monai.apps.detection import metrics
 from monai.metrics.utils import compute_voronoi_regions_fast, do_metric_reduction
 from monai.utils import MetricReduction, deprecated_arg
 from monai.utils.module import optional_import