Bump actions/setup-python from v5 to v6 in /.github/workflows

[UltralyticsAssistant]

Bump actions/setup-python from v5 to v6 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 modernizes the repo by upgrading GitHub Actions to setup-python@v6 and updating several predictor files to use newer Python type hint syntax.

📊 Key Changes

• ⬆️ Updated GitHub Actions workflows in .github/workflows/ci.yml and .github/workflows/push.yml:
  • actions/setup-python@v5 → actions/setup-python@v6
• 🧹 Refactored type annotations in prediction scripts for:
  • yolo11n/predict.py
  • yoloe11s/predict.py
  • yolov8s-worldv2/predict.py
• 🐍 Replaced from typing import Optional with from __future__ import annotations
• ✨ Simplified optional field annotations:
  • Optional[Path] → Path | None
  • Optional[str] → str | None

🎯 Purpose & Impact

• ✅ Keeps CI and release workflows current with the latest GitHub Actions version, helping maintain compatibility and reliability
• 📘 Makes the Python code cleaner and more modern, aligning with newer Python standards
• 🛠️ Reduces dependency on older typing syntax, which can improve readability and long-term maintainability
• 👥 Minimal user-facing change: this is mainly an internal maintenance update, but it helps the repo stay healthy and easier to support over time