Python 3.9 build failing

[chinmayshah99]

Description

Black is failing on python 3.9 all OS types during pytest causing the build to fail.

How to Reproduce

1. https://github.com/OpenMined/PyDP/runs/7263535015?check_suite_focus=true#step:21:35

Additional Context

Add any other context about the problem here.

[divyanshugit]

Hi @chinmayshah99, I would like to work on this. As of now, my observations on this issue:

Cause of the build failure:

• There is some issue with Poetry's latest version v1.4.0 and the editable dependencies.

Solutions: IMO, there are two ways to resolve this issue:

• Fixtate the Poetry's version with some older ones (eg, pip install poetry==1.3.2 in all the prereqs file which installs the poetry)
• Make some changes in our setup tool according to the latest version of poetry. (I'll have to look into this)