[Snyk] Security upgrade metalsmith from 2.5.1 to 2.6.0#6

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kingjay66 wants to merge 1 commit intomainfrom snyk-fix-d23b7631de977039f6feafb06511f93f

+53-30

Commits on Dec 1, 2023

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