Updates Task Resource

Updates an existing EMA Task. Task.id must be a valid TASK|<integer> identifier for an existing task — PM Recall ids are rejected. At least one assignee in input is required, same as create (see the create operation for the assignee shape). The following fields are immutable after creation and will be rejected if changed from their current stored value: authoredOn, description, location, for (patient), and status. Only priority, assignees (input), notes, and the optional reference fields can effectively be changed on update.