[Snyk] Upgrade ecmarkup from 18.3.1 to 20.0.0#6

Graysonbarton merged 1 commit intomainGraysonbarton/ecma262:mainfrom

snyk-upgrade-94b37602e7c7e8c4f45caf145c949a81Graysonbarton/ecma262:snyk-upgrade-94b37602e7c7e8c4f45caf145c949a81Copy head branch name to clipboard