messages-olympus.yml - Ensure that arrays have a maximum number of items

## messages-olympus.yml - Ensure that arrays have a maximum number of items
<img src='https://whitesource-resources.whitesourcesoftware.com/vulnerability_details.png' width=19 height=20> Violation detected in /samples/vonage/messages-olympus.yml:[766-774]

:page_with_curl: File Type: openapi

:no_entry: Details - Ensure that arrays have a maximum number of items