[Snyk] Security upgrade gatsby from 2.18.12 to 4.0.0#570

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ed04a22ac64b126298103a485ae94571

+10,427-7,219

Commits on Jan 26, 2022

fix: starters/gatsby-starter-blog-theme/package.json & starters/gatsby-starter-blog-theme/package-lock.json to reduce vulnerabilities
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