virtualenv==20.22.0 can cause wheels issue when tox try to install requirements/dev.txt

[viniarck]

@italovalcy has spotted this on GitLab CI unit tests nightly, I was looking into it, and just realized that virtualenv==20.22.0 has just been released, and it has broken some compatibilities, we do have virtualenv pinned on requirements/dev.txt, but both on Scrutinizer and GitLab CI we have pre pip commands that install tox version 3, so that leaves room for fetching virtualenv==20.22.0.

On Scrutinizer global config with pip install tox==3.27.1 virtualenv==20.21.0 coverage it's passing again, so the easiest route with less friction is to do the same on GitLab CI unit test pipelines for now. @italovalcy let me know if you could update the .gitlab-ci.yml files accordingly or if you need my help.

In the future, and even potentially on this version 2023.1, we could try to support virtualenv==20.22.0, and adapt setup.py just so wheels don't get triggered since NApps don't support them anyway (we do have a conditional on setup.py but we might need to do something else).

[viniarck]

Landed on #460