[Snyk] Security upgrade gatsby from 2.13.73 to 2.20.21#31

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meghasfdc wants to merge 1 commit intomasterfrom snyk-fix-dc428f77fd9c5114588f3a365f5fe931

+10,937-4,716

Commits on Mar 15, 2021

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