curl --request POST \
  --url https://rest.runpod.io/v1/networkvolumes/{networkVolumeId}/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "my network volume",
  "size": 50
}'

{
  "dataCenterId": "EU-RO-1",
  "id": "agv6w2qcg7",
  "name": "my network volume",
  "size": 50
}