Update links.yml to 900s delay

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

🔗 Adjusted link-checking workflow to improve efficiency.

📊 Key Changes

• Increased the retry delay from 300 seconds (5 minutes) to 900 seconds (15 minutes) in the GitHub workflow for checking links.

🎯 Purpose & Impact

• Benefit: Reduces frequent retry attempts, allowing transient issues more time to resolve naturally.
• Impact: More efficient use of resources and potentially fewer false failure alerts, leading to a smoother user experience in managing link checks.

[UltralyticsAssistant]

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