Update utils.py to fix memory leak in clip_eta function #1247
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Fix memory leak in clip_eta function by removing in-place operations.
This commit addresses a memory leak issue in the clip_eta function located in cleverhans/cleverhans/torch/utils.py. The problem was caused by in-place operations within the function, particularly when modifying the eta tensor. These operations have been replaced with out-of-place equivalents to prevent the accumulation of computational graphs, which was leading to increased memory usage during iterative processes.