fix: remove campos de data de NFEio/Nfe.php

Os campos 'created_at' e 'updated_at' foram removidos de buildItemsToTransmit como parte da refatoracao dos timestamps.

ref: #156

modules/addons/NFEioServiceInvoices/lib/NFEio/Nfe.php

@@ -168,8 +168,6 @@ private function buildItemsToTransmit($items, $invoiceId, $userId, $reissue = fa
                 'environment' => 'waiting',
                 'flow_status' => 'waiting',
                 'pdf' => 'waiting',
-                'created_at' => date('Y-m-d H:i:s'),
-                'updated_at' => 'waiting',
                 'rpsSerialNumber' => 'waiting',
                 'service_code' => $serviceCode,
             ];