CI: Freeze tox version under 4.x
This PR:
- provide a quick and dirty fix for tox (new version of tox limit the use of "external" commands such rm).
[En cours] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
[In progress] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
Prochaine maintenance programmée : lundi 04/11
Plus d'informations sur https://doc-si.inria.fr/display/SU/Gitlab
This PR: