Description

Python 3.6 is reaching its end of support on 2021-12-23: https://www.python.org/downloads/

Maintaining code which can work perfectly on Python 3.6 and above versions is a maintenance burden:

• {Packaging} Drop mock library #19024 (comment)

We need to drop Python 3.6 like how we dropped Python 2.7:

• Drop support for Python 2 in azure-cli #11362
• [Packaging] BREAKING CHANGE: Drop support for Python 2.7 #11363