pin ironic source

Workaround to unblock the CI.

This commit:
- Pins the Ironic source to a WIP upstream gerrit change that resolves
a regression introduced by a recent change.

Signed-off-by: Adam Rozman <adam.rozman@est.tech>

ironic-source-list

@@ -4,10 +4,10 @@ gunicorn
     {% if path.isdir('/sources/' + env.IRONIC_SOURCE) %}
 git+file:///sources/{{ env.IRONIC_SOURCE }}
     {% else %}
-ironic @ git+https://opendev.org/openstack/ironic@{{ env.IRONIC_SOURCE }}
+ironic @ git+https://review.opendev.org/openstack/ironic@refs/changes/85/928885/1
     {% endif %}
 {% else %}
-ironic @ git+https://opendev.org/openstack/ironic
+ironic @ git+https://review.opendev.org/openstack/ironic@refs/changes/85/928885/1
 {% endif %}
 {% if env.IRONIC_LIB_SOURCE %}
     {% if path.isdir('/sources/' + env.IRONIC_LIB_SOURCE) %}