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

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Author: pre-commit-ci[bot]

monai/losses/sure_loss.py

@@ -11,7 +11,7 @@
 
 from __future__ import annotations
 
-from typing import Callable, Optional, cast
+from typing import Callable, Optional
 
 import torch
 import torch.nn as nn