generates xero-python 1.26.0 from OAS 2.40.1

[rdemarco-xero]

All APIs

• Added Idempotency-Key as optional header param for all PUT, POST, PATCH requests

Accounting API

• Updated 1099 report sample JSON response.
• Remove the Contact's SkypeUserName field, from the API.Accouting Contact's endpoints.
• Adds the deletion of allocations to Credit Notes, Prepayments and Overpayments
• Removed random character in getPurchaseOrderAttachmentByFileName
• Removed PAYGLIABILITY, SUPERANNUATIONEXPENSE, SUPERANNUATIONLIABILITY, WAGESEXPENSE from AccountType enum
• Compliance with new IRAS GST rate of 9% starting 2024

Payroll AU

• Added two new enum values in LeavePeriodStatus

Finance

• Cash Validation Api now has rate limiting, there is a new response type added to reflect that.

Files API

• Paging parameters have been added to the associations/{objectid} endpoint