Fix Serializable deprecations triggered by token mocks

Author: derrabus

Tests/AppVariableTest.php

@@ -4,12 +4,12 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\Twig\AppVariable;
+use Symfony\Bridge\Twig\Tests\Fixtures\TokenInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\Flash\FlashBag;
 use Symfony\Component\HttpFoundation\Session\Session;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
-use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 
 class AppVariableTest extends TestCase

Tests/Fixtures/TokenInterface.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Symfony\Bridge\Twig\Tests\Fixtures;
+
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface as BaseTokenInterface;
+
+interface TokenInterface extends BaseTokenInterface
+{
+    public function __serialize(): array;
+    public function __unserialize(array $data): void;
+}