array_column does not respect non-emptyness

[vudaltsov]

https://psalm.dev/r/9f82a17eec

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/9f82a17eec

<?php

/** @psalm-var non-empty-list<array{string}> $nonEmptyList */

$col = array_column($nonEmptyList, 0);

/** @psalm-trace $col */

Psalm output (using commit d8eca89):

INFO: Trace - 7:25 - $col: list<string>

INFO: UnusedVariable - 5:1 - Variable $col is never referenced

[muglug]

Feel free to PR a change to ArrayColumnReturnTypeProvider – should be a relatively easy alteration.