Update npm dependencies to address Dependabot security alerts (#18992)

* npm audit fix

Addresses 1 Dependabot security alert for marked@<2.0.0, which is a dependency of linkinator

GHSA-4r62-v4vq-hr96

* Update jest to latest, which updates node-notifier@<8.0.1, to address 1 Dependabot security alert

GHSA-5fw9-fq32-wv5p

* Update rehype-highlight to latest, which updates highlight.js@<10.4.1, to address 1 Dependabot security alert

GHSA-7wwv-vh3v-89cq

Author: JamesMGreene