Deprecation warning in PHP 8.4 for v2.1.8: Implicitly nullable parameter types

[jkratky]

Hello, I've been using this library and noticed that version 2.1.8 triggers deprecation warnings in PHP 8.4 due to implicitly nullable parameter types, as outlined in this RFC. I see that this issue has already been addressed in version 3.x, but I need to use v2.1.8, which still contains the deprecations.

Error example:

Deprecated: Amp\Http\Server\HttpServer::__construct(): Implicitly marking parameter $options as nullable is deprecated, the explicit nullable type must be used instead in src/HttpServer.php on line 90

This happens because parameters that allow null but do not explicitly use ? in their type declaration are deprecated in PHP 8.4.

Example of the issue in v2.1.8:

 public function __construct(
        array $servers,
        RequestHandler $requestHandler,
        PsrLogger $logger,
        Options $options = null
    ) { /* ... */ }

PHP 8.4-compatible fix:

 public function __construct(
        array $servers,
        RequestHandler $requestHandler,
        PsrLogger $logger,
        ?Options $options = null
    ) { /* ... */ }

Would it be possible to fix this in v2.x?