Get Artist's Upcoming Bookings

curl --request GET \
  --url http://localhost:3000/api/bookings/get-artist-upcoming-bookings

{
  "bookings": [
    {
      "id": "<string>",
      "status": "<string>",
      "dateTimestamp": 123,
      "startTime": 123,
      "endTime": 123,
      "totalFee": "<string>",
      "depositFee": "<string>",
      "location": "<string>"
    }
  ],
  "totalCount": 123
}