Update links.yml to --scheme 'https'

[glenn-jocher]

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🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improving link validation in CI workflows with enhanced security protocol enforcement.

📊 Key Changes

• Added --scheme 'https' to the lychee link checker command in GitHub Actions workflows.

🎯 Purpose & Impact

• Purpose: Ensures that the link checker, lychee, enforces the use of HTTPS when checking the validity of links in the repository, improving overall security posture.
• Impact: Increases the likelihood that all external links used within the project adhere to secure protocols, potentially reducing the risk of transmitting sensitive information over unencrypted channels. Users can feel more confident in the security of the links provided by the project.