chore(2.x): release 2.8.0

[github-actions]

🤖 I have created a release beep boop

2.8.0 (2026-10-10)

Features

• migrate tests to Testo, require PHP 8.2 (#56) (71c3f7e)
• read the GitHub API URL from RR_GITHUB_API_URL (#65) (eff8b50)

Documentation

• refresh the README (#53) (623354c)

Code Refactoring

• add #[\Override] and drop the psalm baseline (#64) (d8a5b3f)
• resolve the Psalm baseline in code (d8a5b3f)

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