[Snyk] Security upgrade metalsmith from 2.3.0 to 2.6.0#10

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martynasb11 wants to merge 1 commit intomasterfrom snyk-fix-fa46272ceed3c00e59768d755905e31d

+94-248

Commits on Dec 6, 2023

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