minor symfony#61574 [Serializer] fix tests (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Serializer] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
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c46301a fix tests

Author: nicolas-grekas

src/Symfony/Component/Serializer/Tests/Normalizer/DateTimeNormalizerTest.php

@@ -139,7 +139,7 @@ public static function normalizeUsingTimeZonePassedInContextAndExpectedFormatWit
                 '2018-12-01T18:03:06.067634',
                 new \DateTimeZone('UTC')
             ),
-            new \DateTimeZone('Europe/Kyiv'),
+            new \DateTimeZone(\in_array('Europe/Kyiv', \DateTimeZone::listIdentifiers(), true) ? 'Europe/Kyiv' : 'Europe/Kiev'),
         ];
 
         yield [