minor #13110 [Security/Http] fix mock logger in test (nicolas-grekas)

This PR was merged into the 2.7 branch.

Discussion
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[Security/Http] fix mock logger in test

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

4e544b9 [Security/Http] fix mock logger in test

src/Symfony/Component/Security/Http/Tests/Firewall/SimplePreAuthenticationListenerTest.php

@@ -110,10 +110,7 @@ class SimplePreAuthenticationListenerTest extends \PHPUnit_Framework_TestCase
             ->will($this->returnValue($this->request))
         ;
 
-        $this->logger = $this->getMockBuilder('Symfony\Bridge\Monolog\Logger')
-            ->disableOriginalConstructor()
-            ->getMock()
-        ;
+        $this->logger = $this->getMock('Psr\Log\LoggerInterface');
 
         $this->securityContext = $this->getMockBuilder('Symfony\Component\Security\Core\SecurityContext')
             ->disableOriginalConstructor()