docs(getting_started): Use 2.6.4

Author: NickLarsenNZ

docs/modules/hbase/pages/getting_started/first_steps.adoc

@@ -85,7 +85,7 @@ include::example$getting_started/getting_started.sh[tag=cluster-version]
 This returns the version that was specified in the HBase cluster definition:
 
 [source,json]
-{"Version":"2.6.3"}
+{"Version":"2.6.4"}
 
 The cluster status can be checked and formatted like this: