[Snyk] Upgrade @metalsmith/markdown from 1.5.0 to 1.6.0#5

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snyk-bot wants to merge 1 commit intomainfrom snyk-upgrade-a999761e262f1b09913eadeb95dcd7dd

+44-17

Commits on Jul 2, 2022

fix: upgrade @metalsmith/markdown from 1.5.0 to 1.6.0
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