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

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Author: pre-commit-ci[bot]

monai/metrics/meandice.py

@@ -309,7 +309,7 @@ def __call__(self, y_pred: torch.Tensor, y: torch.Tensor) -> torch.Tensor | tupl
                 the number of channels is inferred from ``y_pred.shape[1]`` when ``num_classes is None``.
             y: ground truth with shape (batch_size, num_classes or 1, spatial_dims...).
         """
-       
+
 
         # --- Normalize layout to channel-first (N, C, spatial...) ---
         # Prefer a strong signal when available.