Invalid value for invoice after deleting credit note allocation

[ton77v]

Using xero_python==6.3.0

To reproduce:

api_client = ApiClient(...)
accounting_api = AccountingApi(_api_client)

...

accounting_api.delete_credit_note_allocations(
    xero_tenant_id=XERO_TENANT_ID,
    credit_note_id=credit_note_id,
    allocation_id=allocation_id,
)

The allocation will be deleted, however ValueError "Invalid value for invoice, must not be None" will be raised.

It's likely caused by response_type="Allocation" here: https://github.com/XeroAPI/xero-python/blob/master/xero_python/accounting/api/accounting_api.py#L5853

[github-actions]

PETOSS-641

[github-actions]

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