[Snyk] Security upgrade gatsby-source-filesystem from 2.1.43 to 4.21.0#72

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ron-a20 wants to merge 1 commit intomasterfrom

snyk-fix-c2115efdd12f6c02cf4c966fa1a537c7

Commits on Aug 17, 2022

fix: deps/npm/docs/package.json & deps/npm/docs/package-lock.json to reduce vulnerabilities
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