Fix arg #1 of array_walk and array_walk_recursive

[niconoe-]

Add the type object as a possible type for the first argument of array_walk and array_walk_recursive.

The ability to use an object instead of an array in those functions is available since at least PHP 7.0.
Eval: https://3v4l.org/E36RP

I think I heard about an incoming restriction that array_walk and array_walk_recursive could only works with arrays and not objects, but this is not yet how it is designed.

[ondrejmirtes]

Hi, I'm looking into this and this change isn't sufficient. What caught my eyes is that the error is reported even on PHP 8: https://phpstan.org/r/eb2d3854-334c-4ed6-b6bf-a5ca917e0de0

But it shouldn't since PHPStan uses these stubs with the correct typehint: https://github.com/phpstan/php-8-stubs/blob/main/stubs/ext/standard/array_walk.php

This fixes the problem: 902899d