[Snyk] Security upgrade gatsby-source-filesystem from 1.5.11 to 4.21.0#193

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adrianblynch wants to merge 1 commit intomasterfrom snyk-fix-03fdcc0a0a5f1070d9a93db438e537e9

+729-52

Commits on Aug 16, 2022

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