deprecation: fix deprecation for checkPostAuth

[tijsverkoyen]

The "App\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.

Summary by Sourcery

Bug Fixes:

• Fix deprecation warning by updating checkPostAuth signature to include optional TokenInterface parameter

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Anticipate upcoming Symfony interface change by extending the checkPostAuth method to accept an optional TokenInterface argument, preventing deprecation warnings while preserving backward compatibility.

File-Level Changes

Change	Details	Files
Extend checkPostAuth signature to include optional TokenInterface parameter	Imported TokenInterface from Symfony Security Updated method signature of checkPostAuth to add ?TokenInterface $token = null	src/Security/UserChecker.php

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