minor #24167 [Debug] fix test assertion (xabbuh)

This PR was merged into the 3.4 branch.

Discussion
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[Debug] fix test assertion

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Fixes tests for #23816 after the changes made in #24149.

Commits
-------

75a26bb [Debug] fix test assertion

src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php

@@ -204,7 +204,7 @@ class_exists('Test\\'.__NAMESPACE__.'\\'.$class, true);
 
         $xError = array(
             'type' => E_USER_DEPRECATED,
-            'message' => 'The "Test\Symfony\Component\Debug\Tests\\'.$class.'" class '.$type.' "Symfony\Component\Debug\Tests\Fixtures\\'.$super.'" that is deprecated but this is a test deprecation notice',
+            'message' => 'The "Test\Symfony\Component\Debug\Tests\\'.$class.'" class '.$type.' "Symfony\Component\Debug\Tests\Fixtures\\'.$super.'" that is deprecated but this is a test deprecation notice.',
         );
 
         $this->assertSame($xError, $lastError);