Update an existing contact

curl --request PATCH \
  --url https://api.indiepitcher.com/v1/contacts/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "email": "john@acme.com",
  "userId": "1234567",
  "avatarUrl": "https://example.com/avatar.jpg",
  "name": "John Doe",
  "languageCode": "en_US",
  "addedListSubscripitons": [
    "<string>"
  ],
  "removedListSubscripitons": [
    "<string>"
  ],
  "customProperties": {}
}'

{
  "success": true,
  "data": {
    "email": "john@acme.com",
    "userId": 123456,
    "name": "John Doe",
    "avatarUrl": "https://example.com/profile_pictures/123456",
    "languageCode": "en-US",
    "hardBouncedAt": "2024-04-23T18:25:43.511Z",
    "subscribedToLists": [
      "onboarding",
      "newsletter"
    ],
    "customProperties": {
      "company": "Acme",
      "age": 35
    }
  }
}