BGP Session API POST errors after ASNSerializer change on BGPSessionSerializer

[omri-ice]

NetBox version
v2.11.3

Describe the bug
Cannot create a new BGP Session instance via API

To Reproduce
Steps to reproduce the behavior:

1. Go to https://<netbox-instance>/api/docs/
2. POST a new BGP session, examples:

Request 1

{
  "local_as": 4,
  "remote_as": 4,
  "name": "New BGP Session",
  "status": "active",
  "site": 4,
  "device": 482,
  "local_address": 13608,
  "remote_address": 13607
}

Response 1

{
  "local_as": {
    "non_field_errors": [
      "Invalid data. Expected a dictionary, but got int."
    ]
  },
  "remote_as": {
    "non_field_errors": [
      "Invalid data. Expected a dictionary, but got int."
    ]
  }
}

Request 2

{
  "local_as": {"id": 4},
  "remote_as": {"id": 4},
  "name": "New BGP Session",
  "status": "active",
  "site": 4,
  "device": 482,
  "local_address": 13608,
  "remote_address": 13607
}

Response 2

{
  "error": "Cannot assign \"OrderedDict()\": \"BGPSession.local_as\" must be a \"ASN\" instance.",
  "exception": "ValueError",
  "netbox_version": "2.11.3",
  "python_version": "3.8.10"
}

Expected behavior
A new BGP Session should have been created