Bump html-proofer from 5.0.8 to 5.0.9#348

sjrd merged 1 commit intomainscala/scala.epfl.ch:mainfrom

dependabot/bundler/html-proofer-5.0.9scala/scala.epfl.ch:dependabot/bundler/html-proofer-5.0.9Copy head branch name to clipboard