Fix ArrayColumnHelper for non-empty-list<array<string, mixed>> to ret…

[kamil-zacek]

Fix when argument of array_column is non-empty-list with mixed array, also return value is non-empty-string

<?php declare(strict_types = 1);

use function PHPStan\dumpType;
use function PHPStan\Testing\assertType;

class HelloWorld
{
	/**
	 * @param non-empty-list<array<string, mixed>> $list
	 */
	public function testList1(array $list): void
	{
		assertType('non-empty-list<mixed>', array_column($list, 'value'));
	}
}