bump up to 7.81.x

antora.yml

@@ -1,8 +1,8 @@
 ---
 name: docs
 title: Documentation
-version: next
-prerelease: true
+version: 7.81.x
+prerelease: false
 start_page: overview:introduction-to-eclipse-che.adoc
 nav:
   - modules/overview/nav.adoc
@@ -100,8 +100,8 @@ asciidoc:
     prod-upstream: Eclipse Che
     prod-url: "https://__<che_fqdn>__"
     prod-ver-major: "7"
-    prod-ver-patch: "7.80.0"
-    prod-ver: "7.80"
+    prod-ver-patch: "7.81.0"
+    prod-ver: "7.81"
     prod-workspace: che-ws
     prod: Eclipse Che
     prod2: Eclipse Che