post https://app.asana.com/api/1.0/tasks//setParent
Required scope: tasks:write
Updates the parent of a given task. This endpoint can be used to make a task a subtask of another task, or to remove its existing parent.
When using insert_before and insert_after, at most one of those two options can be specified, and they must already be subtasks of the parent.
Returns the complete, updated record of the affected task.