Update required minimum jsonschema version >= 4.16.0

DeprecationWarnings for jsonschema has been fixed at below path.

https://review.opendev.org/c/openstack/tempest/+/875264

But it is required to update the minimum jsonschema version >= 4.16.0
for including a below commit.

https://github.com/python-jsonschema/jsonschema/commit/ee024ffc61bee56b25e816f489d7365fe1445c6d

Closes-Bug: #2008490
Change-Id: I0f459d7f74406e30af725c751f3b7cd1a6a931a6
1 file changed