Update publish.yml

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Minor tweak to the Slack notification format in the GitHub Actions workflow.

📊 Key Changes

• Adjusted the Slack message format slightly by changing quotation marks around a repository variable to backticks.

🎯 Purpose & Impact

• Improved Readability: The change enhances the visual clarity of messages sent to Slack, making it easier for users to identify the repository information.
• Consistency: Maintains a uniform format for inline code elements across messages, helping teams quickly parse details from automated notifications.

[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting a PR to ultralytics/actions! 🚀 This is an automated response, but rest assured an Ultralytics engineer will assist you soon. In the meantime, to help us integrate your work efficiently, please review the checklist below:

• ✅ Clearly Define Your Purpose: Please ensure your PR description clearly conveys the purpose of your update, and link to any relevant issues. This helps in understanding the context and impact of your changes.
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