Swap unsafe_chunk() for chunk()

[glenn-jocher]

Eliminates all unsafe function in YOLOv5 out of an abundance of caution.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved safety in anchor chunking during target building in YOLOv5 loss calculation.

📊 Key Changes

• Replaced unsafe_chunk with chunk in the build_targets method within utils/loss.py.

🎯 Purpose & Impact

• 🛡️ Enhanced Safety: The change from unsafe_chunk to chunk avoids potential out-of-bounds memory access, which can lead to undefined behavior.
• ✨ Reliability: Ensures the target-building process in loss computation is more reliable across various environments and input data scenarios.
• 🚀 User Trust: Users can trust that their models are trained with robust and error-resistant code, likely reducing bugs and training issues.

[glenn-jocher]

Also removes named argument for slight speed improvements.