[Snyk] Security upgrade metalsmith from 2.5.1 to 2.6.0#9

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Redwoodtj wants to merge 1 commit intomainfrom

snyk-fix-64c27ad954461c8b1523db78f39b940f

Commits on Dec 1, 2023

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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