Update User

curl --request PATCH \
  --url https://api.authsignal.com/v1/users/{userId} \
  --header 'Content-Type: application/json' \
  --data '{
  "email": "jane.smith@authsignal.com",
  "phoneNumber": "+123456789012",
  "username": "jane.smith@authsignal.com",
  "displayName": "Jane Smith"
}'

{
  "userId": "<string>",
  "email": "<string>",
  "phoneNumber": "<string>",
  "username": "<string>",
  "displayName": "<string>",
  "custom": {}
}