Merge pull request #27919 from apinnick/mtc-1-4-0-docs-update

MIG-466: MTC version and image names for 1.4.0

Author: apinnick

modules/common-attributes.adoc

@@ -33,5 +33,5 @@ endif::[]
 :launch: image:app-launcher.png[title="Application Launcher"]
 :mtc-short: MTC
 :mtc-full: Migration Toolkit for Containers
-:mtc-version: 1.3
-:mtc-version-z: 1.3.2
+:mtc-version: 1.4
+:mtc-version-z: 1.4.0