[Security] Fix return type declarations

Author: derrabus

Tests/Authentication/Provider/DaoAuthenticationProviderTest.php

@@ -18,6 +18,9 @@
 
 class DaoAuthenticationProviderTest extends TestCase
 {
+    /**
+     * @group legacy
+     */
     public function testRetrieveUserWhenProviderDoesNotReturnAnUserInterface()
     {
         $this->expectException('Symfony\Component\Security\Core\Exception\AuthenticationServiceException');

Tests/Authentication/Provider/UserAuthenticationProviderTest.php

@@ -62,6 +62,9 @@ public function testAuthenticateWhenUsernameIsNotFoundAndHideIsTrue()
         $provider->authenticate($this->getSupportedToken());
     }
 
+    /**
+     * @group legacy
+     */
     public function testAuthenticateWhenProviderDoesNotReturnAnUserInterface()
     {
         $this->expectException('Symfony\Component\Security\Core\Exception\AuthenticationServiceException');