Upgrade Az module to 15.6.1

[perenna-ast]

Using Az cmdlets is generating the below warning:

WARNING: You're using Az version 14.6.0. The latest version of Az is 15.6.1. Upgrade your Az modules using the following commands:
  Update-PSResource Az -WhatIf    -- Simulate updating your Az modules.
  Update-PSResource Az            -- Update your Az modules.
There will be breaking changes from 14.6.0 to 15.6.1. Open https://go.microsoft.com/fwlink/?linkid=2241373 and check the details.

Please provide a version of this with the updated module.