[Snyk] Security upgrade gatsby-source-filesystem from 2.1.21 to 4.21.0#171

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-029132184f255f43c10729b341d604bd

+692-85

Commits on Aug 17, 2022

fix: gatsby/package.json & gatsby/package-lock.json to reduce vulnerabilities
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