Pin tox to < 4.0.0
Tox 4.0.0 was recently released and it has several breaking changes. We pin to < 4.0.0 here. We are planning to move forward only on the master charm branches. Tox is also pinned to < 4.0.0 for stable branches in upstream openstack-zuul-jobs as well as in zosci-config. However, the requires= section in the charm's tox.ini file ends up installing tox>4, wiping out the zuul-pinned tox<4 that was already installed installed. This patch fixes that. Related-Bug: #2002788 Change-Id: I50dbac6e47c6844ec44651db448ff89ae4d5f318changes/22/870122/1
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