[Snyk] Security upgrade gatsby from 2.23.20 to 2.31.0#89

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-84b25daf4d00ece6fd3d235b3643cd9c

+1-1

Commits on Jan 20, 2021

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