Update agent context

curl --request POST \
  --url https://api.wacht.dev/agent/contexts/{id}/update \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --cookie session_id= \
  --data 'title=Updated Conversation Title'

{
  "status": 200,
  "message": "",
  "data": {},
  "session": {
    "id": "123456789012345678",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  },
  "errors": [
    {
      "code": "INVALID_CREDENTIALS",
      "message": "Invalid credentials. Please try again."
    }
  ]
}