Using "new static" should not trigger UnsafeInstantiation in final classes

[AegirLeet]

https://psalm.dev/r/722b67a5a0

As there can't be any child classes, the constructor's signature is known in this case. UnsafeInstantiation shouldn't apply.

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/722b67a5a0

<?php

final class FooException extends RuntimeException
{
    public static function make(): self
    {
        return new static('foo');
    }
}

Psalm output (using commit 7ac6d2e):

ERROR: UnsafeInstantiation - 7:16 - Cannot safely instantiate class FooException with "new static" as its constructor might change in child classes

[muglug]

You can also fix this with new self

[AegirLeet]

Yeah I just prefer static everywhere for consistency.