Update available quantity

curl --request POST \
  --url https://api.chift.eu/consumers/{consumer_id}/commerce/variants/set_quantity/{variant_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "location_id": "<string>",
  "available_quantity": 1
}'

{
  "location": {
    "id": "<string>",
    "name": "<string>"
  },
  "available_quantity": 123
}