fix: symfony 7.4 comp fixes

Security/User/KeycloakBearerUser.php

@@ -261,6 +261,7 @@ class KeycloakBearerUser implements UserInterface
      * 
      * @return void
      */
+    #[\Deprecated]
     public function eraseCredentials(): void
     {
         // TODO: Implement eraseCredentials() method.

Security/User/KeycloakBearerUserProvider.php

@@ -83,7 +83,7 @@ class KeycloakBearerUserProvider implements UserProviderInterface{
      * @param string $class
      * @return bool
      */
-    public function supportsClass(string $class)
+    public function supportsClass(string $class): bool
     {
         return KeycloakBearerUser::class === $class || is_subclass_of($class, KeycloakBearerUser::class);
     }