[Snyk] Upgrade @metalsmith/markdown from 1.6.0 to 1.9.0#15

snyk-bot wants to merge 1 commit intomainhttps-quantumblockchainai-atlassian-net/metalsmith-netlify-starter:mainfrom

snyk-upgrade-c778a5a5dd263efb93abd26317085048https-quantumblockchainai-atlassian-net/metalsmith-netlify-starter:snyk-upgrade-c778a5a5dd263efb93abd26317085048Copy head branch name to clipboard