Revert "Update required minimum jsonschema version >= 4.16.0"

This reverts commit e2315c1cf55b8eb7996c61bed85313d5ff90d07f.

Reason for revert:

We need to support till xena as Tempest master do support stable/xena onwards branches. stable/xena has jsonschema 3.2.0 only https://github.com/openstack/requirements/blob/stable/xena/upper-constraints.txt#L548

We need to avoid such bumping unless something is failing.

Change-Id: Ib6c9ed442b9e4b6c70af7ca7e495e644b17428d7
1 file changed