[AdminBundle] Symfony 7.3 deprecation

[dannyvw]

The "Kunstmaan\AdminBundle\Security\UserChecker::checkPostAuth()" method will require a new "?TokenInterface $token" argument in the next major version of its interface "Symfony\Component\Security\Core\User\UserCheckerInterface", not defining it is deprecated.

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This is from the BaseUser: User Deprecated: Since symfony/security-http 7.3: Implementing "App\Entity\User::eraseCredentials()" is deprecated since Symfony 7.3; add the #[\Deprecated] attribute on the method to signal its either empty or that you moved the logic elsewhere, typically to the "__serialize()" method.