Bump actions/setup-python from v6.2.0 to v6.3.0 in /.github/workflows

[UltralyticsAssistant]

Bump actions/setup-python from v6.2.0 to v6.3.0 in /.github/workflows

This PR updates GitHub Actions references in this repository.

Examples:

• Branch: actions/checkout@main stays on @main
• Major tag: actions/checkout@v4 updates to @v5
• Specific tag: astral-sh/setup-uv@v0.5.0 updates to @v0.9.4
• SHA pinned: actions/checkout@<sha> # v4.1.0 updates to the latest release SHA and tag comment

_{Made with ❤️ by Ultralytics Actions}

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

🔧 This PR updates the GitHub Actions Python setup step in the publish workflow to a newer patch release for improved CI maintenance and reliability.

📊 Key Changes

• Updated .github/workflows/publish.yml to use a newer pinned version of actions/setup-python
• Changed the action reference from v6.2.0 to v6.3.0
• Kept the existing workflow behavior the same, including use of Python 3.x

🎯 Purpose & Impact

• Improves workflow maintenance by keeping GitHub Actions dependencies up to date 📦
• May include upstream fixes, stability improvements, or compatibility updates from the actions/setup-python release 🚀
• Has minimal user-facing impact, but helps keep the publishing pipeline more reliable and secure 🔒
• Reduces risk of CI issues caused by outdated workflow dependencies 🛠️