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. Change-Id: I49c97bbdf83eba8fd527736a1706d3f725c8bd7c
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