cloud version update

cloud using 5.6

Author: pollett

docs/antora.yml

@@ -9,9 +9,9 @@ asciidoc:
     page-url-github-go-sdk: https://github.com/hazelcast/hazelcast-cloud-sdk-go
     page-url-cloud-api: https://cloud.hazelcast.com/v1/api/explorer
     page-code-samples: https://github.com/hazelcast/hazelcast-cloud-code-samples
-    page-cloud-platform-version: 5.3
+    page-cloud-platform-version: 5.6
     page-cloud-console: https://cloud.hazelcast.com/
     page-cloud-signup: https://cloud.hazelcast.com/sign-up
-    full-version: '5.4.0'
+    full-version: '5.6.0'
 nav:
 - modules/ROOT/nav.adoc