Update rebase.yml with workflows permissions

[glenn-jocher]

Update token with workflows permissions

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improve automation security in GitHub actions.

📊 Key Changes

• Changed the token used in the rebase workflow from GITHUB_TOKEN to a new ACTIONS_TOKEN.

🎯 Purpose & Impact

• This change is likely aimed at increasing security and fine-tuning permissions for automatic rebasing actions. 🛡️
• The impact on end-users should be minimal but ensures that the repository automation is more secure and potentially avoids misuse of broader repository permissions. 🤖✨