[Snyk] Security upgrade gatsby from 2.24.79 to 3.0.0#359

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-7b196557fed2c60402d799946cb84f09

+6,908-7,450

Commits on Apr 27, 2021

fix: starters/hello-world/package.json & starters/hello-world/package-lock.json to reduce vulnerabilities
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