Update code style

Author: scheb

src/bundle/Security/Authentication/Token/TwoFactorToken.php

@@ -9,6 +9,7 @@
 use LogicException;
 use RuntimeException;
 use Scheb\TwoFactorBundle\Security\TwoFactor\Provider\Exception\UnknownTwoFactorProviderException;
+use Stringable;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 use function array_key_exists;
@@ -22,7 +23,7 @@
 /**
  * @api Part of the bundle's public API, may be extended
  */
-class TwoFactorToken implements TwoFactorTokenInterface
+class TwoFactorToken implements Stringable, TwoFactorTokenInterface
 {
     /** @var array<string,mixed> */
     private array $attributes = [];

src/trusted-device/Security/TwoFactor/Trusted/TrustedDeviceTokenStorage.php

@@ -145,7 +145,7 @@ private function readCookieValue(): string|null
     {
         $cookieValue = $this->getRequest()->cookies->get($this->cookieName, null);
 
-        return null === $cookieValue ? null : (string) $cookieValue;
+        return $cookieValue ?? null;
     }
 
     private function getRequest(): Request