Symfony version(s) affected: 5.3.6

Description
With this being my config/packages/mailer.php:

<?php declare(strict_types=1);

use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework): void
{
    $framework->mailer()
        ->transport(...)
    ;
};

... phpstan is reporting:

Parameter $framework of anonymous function has invalid typehint type Symfony\Config\FrameworkConfig.

Possible Solution
There's a similar issue over at phpstan, with a proposed solution:
phpstan/phpstan#5189 (comment)