Create merge-main-into-prs.yml

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Introduced a new GitHub Action to automatically merge the main branch into all open PRs to keep them up-to-date.

📊 Key Changes

• Added a new GitHub Actions workflow file: merge-main-into-prs.yml
• The workflow checks out the repository, installs dependencies, and uses a Python script to merge the main branch into open PRs if they are behind.

🎯 Purpose & Impact

• Automation: Keeps all open PRs updated with the latest changes from the main branch automatically. 🤖
• Consistency: Ensures that all PRs are based on the most recent code, reducing merge conflicts and improving code quality. 📈
• Efficiency: Saves developers time by automating a repetitive task, allowing them to focus on more critical issues. ⏱️