2.4.0

• Enhancement: Run tests on PHP 8.1 (#399), by @localheinz
• Fix: Drop support for PHP 7.3 (#400), by @localheinz
• Enhancement: Use Php74 rule set (#401), by @localheinz
• Fix: Add property type declarations (#402), by @localheinz
• Enhancement: Run mutation tests (#403), by @localheinz
• Fix: Collect code coverage with Xdebug (#404), by @localheinz
• Fix: Name (#405), by @localheinz
• Fix: Order (#406), by @localheinz