bug #8 Fix missing LegacyPasswordAuthenticatedUserInterface (coldic3)

This PR was merged into the 1.1-dev branch.

Discussion
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I would like to take advantage of  which specifies  method with  return type. The existence of this interface is checked in Symfony in some places so if the interface exists, the salt will be used back 💃

Commits
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6d82669 Fix missing LegacyPasswordAuthenticatedUserInterface

src/Core/User/UserInterface.php

@@ -4,7 +4,7 @@
 
 namespace SyliusLabs\Polyfill\Symfony\Security\Core\User;
 
-use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
+use Symfony\Component\Security\Core\User\LegacyPasswordAuthenticatedUserInterface;
 use Symfony\Component\Security\Core\User\UserInterface as SymfonyUserInterface;
 
 // Symfony 5.4
@@ -15,22 +15,11 @@ interface UserInterface extends SymfonyUserInterface
 // Symfony 6
 } else {
     /**
+     * @link https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Security/Core/User/LegacyPasswordAuthenticatedUserInterface.php
      * @link https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Security/Core/User/UserInterface.php
-     * @link https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Security/Core/User/PasswordAuthenticatedUserInterface.php
      */
-    interface UserInterface extends SymfonyUserInterface, PasswordAuthenticatedUserInterface
+    interface UserInterface extends LegacyPasswordAuthenticatedUserInterface, SymfonyUserInterface
     {
-        /**
-         * Returns the salt that was originally used to hash the password.
-         *
-         * This can return null if the password was not hashed using a salt.
-         *
-         * This method is deprecated since Symfony 5.3, implement it from {@link LegacyPasswordAuthenticatedUserInterface} instead.
-         *
-         * @return string|null The salt
-         */
-        public function getSalt();
-
         /**
          * @return string
          *