Enum Conversion issue with TaxNumberType on Contact

[terence-qu-tidy]

SDK you're using (please complete the following information):

• Version 12.4.0

Describe the bug
When retrieving Contacts through the AccountingApi#GetContactsAsync method, an exception is thrown, likely through an enum mapping issue.

Error converting value "TAXNUMBERTYPE/EIN" to type 'Xero.NetStandard.OAuth2.Model.Accounting.Contact+TaxNumberTypeEnum'. Path 'Contacts[309].TaxNumberType', line 17832, position 42.

To Reproduce
Steps to reproduce the behavior:

1. Call AccountingApi#GetContactsAsync where one of the contacts returned has the Tax Number Type "EIN".
2. An ApiException should be thrown.

Screenshots
Here is a snippet of the API response before it is deserialized via the SDK.

{
  "Id" : "e67709ec-08e7-41c6-831d-65c664274075",
  "Status" : "OK",
  "ProviderName" : "TidyStock (DEV)",
  "DateTimeUTC" : "/Date(1764133671124)/",
  "Contacts" : [ {
    "ContactID" : "9ba3c9d5-390d-4370-8dae-9cacb9886957",
    "AccountNumber" : "test",
    "ContactStatus" : "ACTIVE",
    "Name" : "Test",
    "FirstName" : "test",
    "LastName" : "test",
    "TaxNumber" : "xxxxxxx789",
    "Addresses" : [ {
      "AddressType" : "POBOX"
    }, {
      "AddressType" : "STREET"
    } ],
    "Phones" : [ {
      "PhoneType" : "DDI"
    }, {
      "PhoneType" : "DEFAULT"
    }, {
      "PhoneType" : "FAX"
    }, {
      "PhoneType" : "MOBILE"
    } ],
    "UpdatedDateUTC" : "/Date(1764133029790+0000)/",
    "ContactGroups" : [ ],
    "IsSupplier" : false,
    "IsCustomer" : false,
    "TaxNumberType" : "TAXNUMBERTYPE/EIN",  <-- Should be called 'EIN' without the 'TAXNUMBERTYPE/' part
    "ContactPersons" : [ ],
    "HasAttachments" : false,
    "HasValidationErrors" : false
  } ]
}

Expected behavior
The Contact list should be returned successfully.

[github-actions]

PETOSS-862

[github-actions]

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