check_git_status() bug fix

[glenn-jocher]

Fix for UnboundLocalError: local variable 's' referenced before assignment.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved code readability and exception handling in the check_git_status function.

📊 Key Changes

• Removed unnecessary assignment of the exception message to a variable before printing.
• Corrected indentation for a user message related to updating the repository.

🎯 Purpose & Impact

• 🎨 Enhances clarity of the code by simplifying exception handling, making it easier for developers to read and maintain.
• 🔄 Ensures users receive clear instructions on how to update their local repository if it falls behind the origin master branch.