minor #39497 [PhpUnitBridge] [phpunit] Stop using deprecated trait (jderusse)

This PR was merged into the 4.4 branch.

Discussion
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[PhpUnitBridge] [phpunit] Stop using deprecated trait

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

the `SetUpTearDownTrait` trait has been removed in #39487 this PR remove usage of it in branch 4.4

Commits
-------

55ed00cd3c Stop using deprecated trait

Author: nicolas-grekas

Tests/DeprecationErrorHandler/DeprecationTest.php

@@ -15,12 +15,9 @@
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler;
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler\Deprecation;
 use Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerForV5;
-use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
 
 class DeprecationTest extends TestCase
 {
-    use SetUpTearDownTrait;
-
     private static $vendorDir;
     private static $prefixDirsPsr4;
 
@@ -261,7 +258,7 @@ private static function removeDir($dir)
         rmdir($dir);
     }
 
-    private static function doSetupBeforeClass()
+    public static function setupBeforeClass(): void
     {
         foreach (get_declared_classes() as $class) {
             if ('C' === $class[0] && 0 === strpos($class, 'ComposerAutoloaderInit')) {
@@ -281,7 +278,7 @@ private static function doSetupBeforeClass()
         }
     }
 
-    private static function doTearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         foreach (self::$prefixDirsPsr4 as [$prop, $loader, $prefixDirsPsr4]) {
             $prop->setValue($loader, $prefixDirsPsr4);