[Security] Fix type in upgradePassword

[Synxgz]

Fix the wrong type for the method upgradePassword according to PasswordUpgraderInterface.

It is wrong since the 6.0, the signature has changed from PasswordAuthenticatedUserInterface|UserInterface to PasswordAuthenticatedUserInterface in PasswordUpgraderInterface.

Commit: symfony/symfony@30e2c00#diff-b31195679b81d7a86cf868774ef3bf74a79e8e059250db399531b989b4919bdeL17

Prevents PHP Error :

Compile Error: Declaration of App\Services\Security\EmailUserProvider::upgradePassword(Symfony\Component\Security\Core\User\UserInterface $user, string $newHashedPassword): void must be compatible with Symfony\Component\Security\Core\User\PasswordUpgraderInterface::upgradePassword(Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface $user, string $newHashedPassword): void

[javiereguiluz]

Good catch Romain! Thanks ... and congrats on your first Symfony Docs contribution 🎉