(SEC-431) update jetty to 9.4.39.v20210325 to resolve CVEs
(SEC-431) update jetty to 9.4.39.v20210325 to resolve CVEs

- CVE-2021-28165 - #6072 - jetty server high CPU when client send data length > 17408
- CVE-2021-28164 - #6101 - Normalize ambiguous URIs
- CVE-2021-28163 - #6102 - Exclude webapps directory from deployment scan

puppetlabs/trapperkeeper-webserver-jetty9,puppetlabs/trapperkeeper-webserver-jetty9