fix: #3550787 [random test failure] CKEditor5Test::testLanguageOfPartsPlugin()

Derek Wrightrequested to merge
issue/drupal-3550787:3550787-random-test-fail-CKEditor5Test into 11.x

Closes #3550787

REPEAT_TEST_CLASS : Drupal\Tests\ckeditor5\FunctionalJavascript\CKEditor5Test
REPEAT_COUNT : 250

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