[Snyk] Security upgrade metalsmith from 2.3.0 to 2.6.0#8

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lidorg-dev wants to merge 1 commit intomasterfrom snyk-fix-2c004e3b082e8aa2403cf2797ebdbba3

+101-251

Commits on Nov 30, 2023

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