Update Collection ParentId

[hendrik-advantitge]

Describe the bug When updating a Collection using the UpdateCollection mutation, the value for parentId is ignored.

To Reproduce Steps to reproduce the behavior:

1. Create 2 collections with parent = root (= collections 1 and 2)
2. Create collection 3 with parent = 1
3. Update collection 3 with

mutation {
  updateCollection(input: {
    id: 3
    parentId: 2
  }) {
    id
    parent { id }
  }
}

4. Observe parentId will still be 1

Expected behavior ParentId should be updated when updating collection

Environment (please complete the following information):

• @vendure/core version: 1.7.1