Fix publish-releasenotes
Fix publish-releasenotes

The releasenotes variable has been moved inside the job in
I0323f8f1bccf720268d947b8e1dcb6c5f8b26dfa. We need to mirror the change
here.

Change-Id: I3ca061c11251505c81dcef9a8f5cee37fa72e658

openstack-infra/project-config,openstack-infra/project-config