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

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