TypeCombiner combines class-string which results in less-specific type

[boesing]

https://psalm.dev/r/36d67d45fb

refs: #9599

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/36d67d45fb

<?php

interface CallableObjectInterface
{
    public function __invoke(): void;
}

function callableFunction(): void
{}

/** @param class-string<CallableObjectInterface>|class-string<object&callable():void> $callable */
function takesClassStringOfEitherCallableObjectOrCallableFunction(string $callable): void
{
	/** @psalm-trace $callable */
}

Psalm output (using commit 5efddb4):

INFO: Trace - 14:0 - $callable: class-string

INFO: UnusedParam - 12:74 - Param callable is never referenced in this method