Fix matches[0] type for regexes containing "\K"#3920

ondrejmirtes merged 4 commits intophpstan:2.1.xphpstan/phpstan-src:2.1.xfrom

mvorisek:fix_12792_pcre_k_escapemvorisek/phpstan-src:fix_12792_pcre_k_escapeCopy head branch name to clipboard