Issue #3232074 by bbrala, daffie, alexpott, effulgentsia, catch, gabesullice:...

Issue #3232074 by bbrala, daffie, alexpott, effulgentsia, catch, gabesullice: [Symfony 6] Add "array|string|int|float|bool|\ArrayObject|null" to all Normalizer classes that implement the method ::normalize()