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

Upgraded GitHub Actions Python setup from actions/setup-python@v6 to @v7 across CI and publishing workflows. 🚀

📊 Key Changes

• Updated actions/setup-python to version @v7 in .github/workflows/ci.yml.
• Updated all Python setup steps in .github/workflows/publish.yml to @v7.
• Applied the upgrade consistently across testing, package publishing, and release-related jobs.

🎯 Purpose & Impact

• 🔧 Keeps automation workflows aligned with the latest supported setup action.
• ✅ Improves consistency and may provide updated compatibility, performance, and security improvements.
• 📦 No direct changes to the package, APIs, or user-facing functionality.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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