Return type declaration must be compatible with FileUploadForm [#3614206]

Problem/Motivation

Drupal\dropzonejs\Form\DropzoneJsUploadForm:

Return type declaration must be compatible with FileUploadForm->validateUploadElement(element: array, form_state: \Drupal\Core\Form\FormStateInterface) : array

Issue fork dropzonejs-3614206

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3614206-return-type-declaration changes, plain diff MR !37
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