fix code quality, typage, php-csfixer

src/Security/SQLLoginUserProvider.php

@@ -31,7 +31,7 @@ class SQLLoginUserProvider implements UserProviderInterface
         return $this->loadUserByIdentifier($username, null);
     }
 
-    public function refreshUser(UserInterface $user)
+    public function refreshUser(UserInterface $user): UserInterface|null
     {
         if (!$user instanceof User) {
             throw new UnsupportedUserException(sprintf('Invalid user class "%s".', get_class($user)));
@@ -40,7 +40,7 @@ class SQLLoginUserProvider implements UserProviderInterface
         return $this->loadUserByIdentifier($user->getUserIdentifier(), $user);
     }
 
-    public function supportsClass(string $class)
+    public function supportsClass(string $class): bool
     {
         return User::class === $class || is_subclass_of($class, User::class);
     }