Update greetings.yml

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update to GitHub workflow to favor merging over rebasing for feature branch updates.

📊 Key Changes

• Improved the GitHub greetings.yml workflow by changing the update strategy from rebasing (git rebase) to merging (git merge).

🎯 Purpose & Impact

• 🎨 This change aims to simplify the process of updating a local feature branch with the latest changes from the main branch.
• 👥 It reduces the potential for conflicts and complexities that can arise from rebasing, making it more contributor-friendly.
• 🔁 Users can now update their work more seamlessly, which may encourage more contributions and smoother collaboration.