Update antora-ui-spring to version 0.3.7

Author: fmbenhassine

spring-batch-docs/antora-playbook.yml

@@ -36,5 +36,5 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.3/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.7/ui-bundle.zip
     snapshot: true