Update Jetty to 9.4.42
Update Jetty to 9.4.42

Fixes two known vulnerabilities in Jetty:
- https://nvd.nist.gov/vuln/detail/CVE-2021-28169
- https://nvd.nist.gov/vuln/detail/CVE-2021-34428

ring-clojure/ring,ring-clojure/ring