XWIKI-22912: The current user proerty update REST endpoint is modifying the cached document

(cherry picked from commit 8e9d9225)

xwiki-platform-core/xwiki-platform-rest/xwiki-platform-rest-server/src/main/java/org/xwiki/rest/internal/resources/user/CurrentUserPropertyResourceImpl.java

@@ -90,6 +90,9 @@ public Response setNextPropertyValue(String propertyName) throws XWikiRestExcept
                 throw new WebApplicationException(Status.UNAUTHORIZED);
             }
 
+            // Clone the document to avoid modifying the cache directly
+            userDocument = userDocument.clone();
+
             BaseObject object = userDocument.getXObject(USER_REFERENCE);
             if (object == null) {
                 throw new WebApplicationException(Status.NOT_FOUND);