Update scipy>=1.7.3

[glenn-jocher]

🛠️ PR Summary

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🌟 Summary

Updating minimum required version of scipy in dependencies.

📊 Key Changes

• The scipy library version requirement has been raised from >=1.4.1 to >=1.7.3 in the requirements.txt file.

🎯 Purpose & Impact

• Purpose: To ensure compatibility with new features or to address known issues that have been resolved in newer versions of scipy.
• Impact: Users will need to update their scipy installation to at least version 1.7.3 to use the latest version of yolov5. This may lead to improvements in performance or stability for users who were using older versions of scipy. 🚀👍