chore(2.x): release 2.4.0

[github-actions]

🤖 I have created a release beep boop

2.4.0 (2026-10-09)

Features

• migrate tests to Testo, require PHP 8.2 (#21) (a870150)

Bug Fixes

• declare the statuses() error key as present and nullable (#24) (6d866a3)

Documentation

• refresh README (#18) (70100de)

Code Refactoring

• drop the redundant Status assertion in Manager::statuses() (6d866a3)

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