MIG-1727: Attributes Updates for MTC 1.8.7

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

Author: anarnold97

_attributes/common-attributes.adoc

@@ -72,7 +72,7 @@ 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
 :mtv-first: Migration Toolkit for Virtualization (MTV)
 :mtv-short: MTV