Update github banner

[glenn-jocher]

copilot:all

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to the Ultralytics GitHub banner image.

📊 Key Changes

• The GitHub banner image (banner-ultralytics-github.png) has been updated.

🎯 Purpose & Impact

• Enhanced Branding: The updated banner likely includes refreshed branding or new visual elements, aligning with the company's current marketing strategy.
• Improved User Experience: Users visiting the Ultralytics GitHub page will see a more modern and potentially informative banner.
• Visual Consistency: The banner update may be part of maintaining visual consistency across various platforms where Ultralytics is present.