update php v8 found an error

[YisusW]

peg/src/PegGrammar.php

Line 193 in 053baea

return ['literal', implode('', array_map('next', $nested[1]))];

when i've been running the unit test to make suree everything is okay i found this probleem:

error message => next(): Argument #1 ($array) must be passed by reference, value given

whre is that 'next' callback function?