Updates the user details. You can only update the IAM role associated with a user.
See https://www.paws-r-sdk.com/docs/finspace_update_kx_user/ for full documentation.
finspace_update_kx_user(environmentId, userName, iamRole, clientToken = NULL)
[required] A unique identifier for the kdb environment.
[required] A unique identifier for the user.
[required] The IAM role ARN that is associated with the user.
A token that ensures idempotency. This token expires in 10 minutes.