Bump decorator version in lower-constraints.txt
Bump decorator version in lower-constraints.txt

This patch update decorator version to 4.4.2 in
lower-constraints.txt to fix the lower-constraints job.

Change-Id: I70c82525454c93d2d763b5f304d8fa7d2f57b1f8

openstack/sahara-dashboard,openstack/sahara-dashboard,openstack/sahara-dashboard,openstack/sahara-dashboard