Update links.yml to --scheme https

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improving link verification process with enforced HTTPS for Ultralytics' GitHub workflows.

📊 Key Changes

• Added the --scheme 'https' option to the Lychee link checker in GitHub workflows.
• This addition has been applied in two instances within the links.yml file.

🎯 Purpose & Impact

• 🎯 Purpose: Ensures that all URLs checked by the workflow are using the secure HTTPS protocol instead of HTTP, promoting better security practices.
• 💥 Impact: Strengthens the integrity of external links in the repository by verifying they are secure, which can protect users against potential security risks related to unsecured HTTP connections.