Update my portfolio allocation

curl --request POST \
  --url https://{host}/portfolios/me/allocation \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-user-id: <x-user-id>' \
  --data '
{
  "allocation": {
    "equities_uk": 50,
    "equities_eu": 50
  }
}
'

{
  "id": "<string>",
  "currency": "<string>",
  "holdings": [
    {
      "isin": "<string>",
      "assetCommonId": "<string>",
      "quantity": 123
    }
  ],
  "targetAllocation": [
    {
      "assetCommonId": "<string>",
      "percentage": 123
    }
  ],
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z"
}