Invokable objects incorrectly labeled as instances of `\Closure`

[HypeMC]

Bug report

Currently, PHPStan assumes every invokable object is an instance of \Closure, which is not necessarily true.

Code snippet that reproduces the problem

https://phpstan.org/r/467b09b4-6731-4c87-b228-a6f91fa0204e

Expected output

Invokable object aren't necessarily instances of \Closure, eg:

class Foo
{
    public function __invoke() {}
}

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