[Snyk] Security upgrade gatsby from 2.13.73 to 2.31.0#42

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ab0a3be139908ec8b1ea3304e79f2527

+10,622-4,087

Commits on Sep 5, 2021

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