message: Fix memory error on shutdown (PHP-8.1)
  Ref of function_name was held by zend_fcall_info_init().
diff: @@ -306,7 +306,6 @@ void php_swoole_register_shutdown_function(const char *function) {
  zend_fcall_info_init(
  &function_name, 0, &shutdown_function_entry.fci, &shutdown_function_entry.fci_cache, NULL, NULL);
  register_user_shutdown_function(Z_STRVAL(function_name), Z_STRLEN(function_name), &shutdown_function_entry);
  - zval_ptr_dtor(&function_name);
  #else
  zval *function_name;
  #if PHP_VERSION_ID >= 80000
  