Update version number of legacy MTC operator for 1.5.3

apinnick · apinnick · commit fd035a30568e · 2021-12-09T12:40:43.000+02:00
diff --git a/modules/common-attributes.adoc b/modules/common-attributes.adoc
@@ -43,4 +43,4 @@ endif::[]
 :mtc-full: Migration Toolkit for Containers
 :mtc-version: 1.6
 :mtc-legacy-version: 1.5
-:mtc-legacy-version-z: 1.5.1
+:mtc-legacy-version-z: 1.5.3
