Fix wrong rdkafka commitAsync type

[danog]

No description provided.

[danog]

Also, it seems that the RdKafka\Consumer::newTopic and RdKafka\Producer::newTopic return types aren't actually used during type resolution:

<?php

/** @var \RdKafka\Consumer $a */
$a = null;

$topic = $a->newTopic('test', null);
/** @psalm-trace $topic */;

Result:

INFO: Trace - a.php:7:27 - $topic: RdKafka\Topic (see https://psalm.dev/224)
/** @psalm-trace $topic */;

Should be:

INFO: Trace - a.php:7:27 - $topic: RdKafka\ConsumerTopic (see https://psalm.dev/224)
/** @psalm-trace $topic */;

[muglug]

Thanks!