GHSA-r7cg-qjjm-xhqq: webonyx/graphql-php has unbounded recursion in parser that causes stack overflow on crafted nested input

GraphQL\Language\Parser is a recursive descent parser with no recursion depth limit and no zend.max_allowed_stack_size interaction. Crafted nested queries trigger a SIGSEGV in the PHP runtime, killing the FPM/CLI worker process. Smallest crashing payload is approximately 74 KB.