Update Ultralytics YouTube URL

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced Ultralytics YouTube link for direct subscription prompt.

📊 Key Changes

• Updated the YouTube link to include a subscription prompt.

🎯 Purpose & Impact

• Easier Subscriptions: The main benefit is making it easier for interested viewers to subscribe to the Ultralytics YouTube channel directly from the link. 📈
• User Experience: Improves user experience by providing a seamless way for followers to engage with more content without extra searches or clicks. 🚀
• Potential Impact: Could potentially increase the subscription rate, ensuring more users stay connected with Ultralytics updates and tutorials. 🌍