[Snyk] Security upgrade gatsby from 2.18.12 to 4.0.0#567

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-9334ea6002d65e0c58bcc06bba73000d

+7,832-10,477

Commits on Jan 26, 2022

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