Upgrade to UI resources 0.3.3.

See #2912

Author: mp911de

src/main/antora/antora-playbook.yml

@@ -33,5 +33,5 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.0/ui-bundle.zip
-    snapshot: true
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.3/ui-bundle.zip
+    snapshot: true