Update antora playbook

Author: fmbenhassine

Diff for: spring-batch-docs/antora-playbook.yml

@@ -4,9 +4,10 @@
 antora:
   extensions:
     - '@springio/antora-extensions/partial-build-extension'
+    - '@antora/atlas-extension'
+    - require: '@springio/antora-extensions/latest-version-extension'
     - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
     - '@antora/collector-extension'
-    - '@antora/atlas-extension'
     - require: '@springio/antora-extensions/root-component-extension'
       root_component_name: 'batch'
     - '@springio/antora-extensions/static-page-extension'
@@ -37,5 +38,5 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.11/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.15/ui-bundle.zip
     snapshot: true