Update the mapping of a ledger

curl --request PUT \
  --url http://localhost:55001/api/ledger/{ledger}/mapping \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "contracts": [
    {
      "account": "users:001",
      "expr": {}
    }
  ]
}'

{
  "data": {
    "contracts": [
      {
        "account": "users:001",
        "expr": {}
      }
    ]
  }
}