MIG-1727: Attributes Updates for MTC 1.8.7

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

Author: anarnold97

_attributes/common-attributes.adoc

@@ -68,7 +68,7 @@ endif::[]
 :mtc-short: MTC
 :mtc-full: Migration Toolkit for Containers
 :mtc-version: 1.8
-:mtc-version-z: 1.8.6
+:mtc-version-z: 1.8.7
 :mtc-legacy-image: 1.7
 // builds (Valid only in 4.11 and later)
 :builds-v2title: Builds for Red Hat OpenShift