Update README LICENSE link

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to licensing information link in the README.

📊 Key Changes

• Changed the URL for the AGPL-3.0 License details.

🎯 Purpose & Impact

• Clarity and Correctness: Ensures users are redirected to the correct license file for accurate information. 📝
• Ease of Access: Simplifies the process for users, especially in academia and open collaboration, to understand their rights and obligations under the AGPL-3.0 License. 🎓
• No Direct Impact on functionality or use, but improves user experience by ensuring transparency and accessibility of licensing information. 🌐

Emoji Legends:
📝 - Information Accuracy
🎓 - Academic and Collaboration Enhancement
🌐 - Global User Experience Improvement