[Snyk] Security upgrade react-docgen from 2.21.0 to 5.2.0#962

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-c59bcb1974d11ba0cc6ba231ea1090f4

Commits on Apr 7, 2022

fix: packages/gatsby-transformer-react-docgen/package.json to reduce vulnerabilities
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