[Snyk] Security upgrade metalsmith from 2.4.2 to 2.6.0#8

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Susangriffis wants to merge 1 commit intomainfrom snyk-fix-1e197f360907743eaeb5f197089ad98d

+75-240

Commits on Nov 30, 2023

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