Fix PHP 8.4 deprecation: Implicitly marking parameter as nullable is deprecated, the explicit nullable type must be used instead

[tuandp]

BaoPham\DynamoDb\DynamoDbQueryBuilder::after(): Implicitly marking parameter $after as nullable is deprecated, the explicit nullable type must be used instead

BaoPham\DynamoDb\DynamoDbQueryBuilder::withoutGlobalScopes(): Implicitly marking parameter $scopes as nullable is deprecated, the explicit nullable type must be used instead

BaoPham\DynamoDb\DynamoDb\QueryBuilder::prepare(): Implicitly marking parameter $client as nullable is deprecated, the explicit nullable type must be used instead 

[scrutinizer-notifier]

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