fix(accounting): make UpdatedDateUTCString a plain string

Author: gcxero

xero_accounting.yaml

@@ -21658,9 +21658,8 @@ components:
           example: /Date(1573755038314)/
           readOnly: true
         UpdatedDateUTCString:
-          description: UTC ISO-8601 formatted timestamp of last update to the credit note 
+          description: UTC ISO-8601 formatted timestamp of last update to the credit note
           type: string
-          format: date-time
           example: 2019-11-14T18:10:38Z
           readOnly: true
         CurrencyCode:
@@ -22503,7 +22502,6 @@ components:
         UpdatedDateUTCString:
           description: UTC ISO-8601 formatted timestamp of last update to the invoice
           type: string
-          format: date-time
           example: 2019-11-14T18:10:38Z
           readOnly: true
         CreditNotes:
@@ -23757,7 +23755,6 @@ components:
         UpdatedDateUTCString:
           description: UTC ISO-8601 formatted timestamp of last update to the overpayment
           type: string
-          format: date-time
           example: 2019-11-14T18:10:38Z
           readOnly: true
         CurrencyCode:
@@ -23912,7 +23909,6 @@ components:
         UpdatedDateUTCString:
           description: UTC ISO-8601 formatted timestamp of last update to the payment
           type: string
-          format: date-time
           example: 2019-11-14T18:10:38Z
           readOnly: true
         PaymentID:
@@ -24038,7 +24034,6 @@ components:
         UpdatedDateUTCString:
           description: UTC ISO-8601 formatted timestamp of last update to the prepayment
           type: string
-          format: date-time
           example: 2019-11-14T18:10:38Z
           readOnly: true
         CurrencyCode: