fixes national insurance number

Author: manishT72x

xero-payroll-uk.yaml

@@ -327,7 +327,7 @@ paths:
                   gender: M
                   email: tester1@gmail.com
                   phoneNumber: '0400123456'
-                  nationalInsuranceNumber: 
+                  nationalInsuranceNumber: AB123456C
                   isOffPayrollWorker: false
                   address:
                     addressLine1: 171 Midsummer