[Snyk] Security upgrade gatsby-source-filesystem from 2.1.21 to 4.21.0#74

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kissofire wants to merge 1 commit intomasterfrom

snyk-fix-c6879b0bf9e446f717dc707335ff2b21

Commits on Aug 16, 2022

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