Fix return type of pcntl_signal_get_handler #4544
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pcntl_signal_get_handlerreturns the defined callable orSIG_DFL/SIG_IGNif none has been defined viapcntl_signal.https://www.php.net/manual/en/function.pcntl-signal-get-handler.php
https://github.com/php/php-src/blob/e97c0dc340be7387498b92b182b9356b960a3bd0/ext/pcntl/pcntl.c#L863
https://phpstan.org/r/7632586d-bc04-4b97-865f-3cb5125037a8