[Snyk] Upgrade @metalsmith/markdown from 1.6.0 to 1.8.0#13

q1blue wants to merge 1 commit intomainhttps-quantumblockchainai-atlassian-net/metalsmith-netlify-starter:mainfrom

snyk-upgrade-24d9712ce814871bd2cd9c025dd6ec70https-quantumblockchainai-atlassian-net/metalsmith-netlify-starter:snyk-upgrade-24d9712ce814871bd2cd9c025dd6ec70Copy head branch name to clipboard