Add non-latest windows versions to ci pipeline

[munichpavel]

E.g. got a windows path too long error with one student, like here: Azure/azure-cli#1221

Using Windows 10 Pro

[munichpavel]

Attempts

I think I remember getting this windows error before ...

https://github.com/munichpavel/risk-ai-workshop/runs/6010269597?check_suite_focus=true

7
C:\hostedtoolcache\windows\Python\3.6.8\x64\python.exe: No module named pytest
8
Error: Process completed with exit code 1.

Yup, I fixed this for windows latest by excluding older windows python versions.

[munichpavel]

Closed with 9633346, though still doesn't show problems students faced with local installs.