[php-src] Issue #9897: declare `param-out` in stubs

Issue: https://github.com/php/php-src/issues/9897 Author: staabm ### Description since [phpstan 1.9 support for @param-out phpdoc was added](https://phpstan.org/blog/phpstan-1-9-0-with-phpdoc-asserts-list-type#parameter-type-assigned-by-reference). [psalm supports it](https://psalm.dev/docs/annotating_code/supported_annotations/#param-out-psalm-param-out) for a longer time. it would be great if the php-src stub files could annotate the sources with @param-out when the types a parameter manipulated by referenced are known. that way the tools could consume the types, without the need to maintain such list in all tools redundantly. one example is e.g. https://github.com/php/php-src/blob/02ed12240ede3c012faab5c9dda759c0cc45969f/ext/curl/curl.stub.php#L3598-L3603