MIG-1549: Attribute Updates for 1.8.4

Signed-off-by: A.Arnold <anarnold@redhat.com>

Author: anarnold97

_attributes/common-attributes.adoc

@@ -71,7 +71,7 @@ endif::openshift-origin[]
 :mtc-short: MTC
 :mtc-full: Migration Toolkit for Containers
 :mtc-version: 1.8
-:mtc-version-z: 1.8.3
+:mtc-version-z: 1.8.4
 // builds (Valid only in 4.11 and later)
 :builds-v2title: Builds for Red Hat OpenShift
 :builds-v2shortname: OpenShift Builds v2