Bump actions/setup-python from v6 to v7 in /.github/workflows

[UltralyticsAssistant]

Bump actions/setup-python from v6 to v7 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

Updated GitHub Actions workflows to use the latest actions/setup-python version. ⚙️

📊 Key Changes

• Upgraded actions/setup-python from v6 to v7 in:
  • The link-checking workflow.
  • The tag-release workflow.
• No changes were made to documentation content or workflow behavior.

🎯 Purpose & Impact

• Keeps CI workflows aligned with the latest supported GitHub Action version. ✅
• May provide improved compatibility, maintenance, and security for Python environment setup.
• Link validation and tag-based release processes should continue working as before. 🚀