[Snyk] Security upgrade gatsby from 2.18.18 to 2.19.25#26

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-5f9f569231a9c79a896471cd80f81a4e

+7,004-3,348

Commits on Jun 18, 2021

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