Update client

curl --request PUT \
  --url https://api.tilt.io/custom/org/{organization_uuid}/client/{external_id}/ \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '{
  "external_id": "<string>",
  "holdings": {
    "holdings": [
      {
        "symbol": "<string>",
        "quantity": "<string>"
      }
    ],
    "tax_lots": [
      {
        "ticker": "<string>",
        "quantity": "<string>",
        "cost_basis": "<string>",
        "trade_date": "2023-12-25"
      }
    ],
    "cash_balance": "<string>"
  },
  "benchmark_index": "<string>",
  "tilts": [
    {
      "tilt": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "factor": "<string>"
    }
  ],
  "no_hold_tickers": [
    "<any>"
  ],
  "no_trade_tickers": [
    "<any>"
  ],
  "min_weight": "<string>",
  "max_weight": "<string>",
  "scaling_factor": "<string>"
}'

{
  "external_id": "<string>",
  "benchmark_index": "<string>"
}