[Snyk] Security upgrade gatsby from 2.18.12 to 4.0.0#565

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6cd419687f450a76a44895ce8c91b772

+10,729-9,097

Commits on Jan 26, 2022

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