Add Python 3.14 support

[glenn-jocher]

Summary

• advertise Python 3.14 support in package classifiers
• include Python 3.14 in the CI test matrix

Tests

• python -c "import tomllib; tomllib.load(open("pyproject.toml", "rb"))"
• actionlint .github/workflows/*.yml

[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting a ultralytics/template 🚀 PR! This is an automated message to help streamline review, and an engineer will assist you soon. Please review the checklist below for a smooth merge ✨

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

Clean PR. The changes consistently add Python 3.14 coverage in CI, formatting automation, and package metadata, and I don't see any clear issues in the diff that warrant blocking comments.