Class constants declaring class fix for PHPStan 2.1.38+, better tests

Constants

• Don't include template types in constant's declaring class display name, needed for PHPStan 2.1.38+ (#363)
• Update the docs for constant usage in params (#364)

Tests

• Run e2e tests on PHP 8.5 (#356, #359)
• Analyze bin (#358)

Dependency updates

• Bump actions/checkout from 5 to 6 (#357)
• Upgrade shipmonk/dead-code-detector (#362)