Changes to Bulk Update Deliveries

added the new optional request property deliveries/items/pickedItems

added barcode_scan_on_dropoff barcode_scan_on_pickup barcode_scan_on_return photo_pre_delivery_verification photo_proof_of_delivery photo_proof_of_pickup signature_proof_of_delivery signature_proof_of_pickup discriminator mapping keys to the deliveries/items/proofOfDelivery/anyOf[subschema #1]/items request property

added the new items_pick_complete enum value to the request property deliveries/items/status/anyOf[subschema #1: DeliveryStatusUpdateValue]