fix: key participant status like the participants they belong to

src/BusProNet/DataProcessor/BookingPayloadBuilder.php

@@ -96,7 +96,7 @@ class BookingPayloadBuilder
         foreach ($bookingData->participants as $index => $participant) {
             $participantPayload = [
                 '@id' => $index + 1,
-                'status' => $bookingData->participantsStatus[$index],
+                'status' => $bookingData->participantsStatus[$index] ?? null,
                 ...$participant->toPayload(),
             ];