[Snyk] Security upgrade gatsby from 2.24.79 to 2.31.0#38

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-f781ce87998d3a4d46af2d6e4af92ab7

+4,108-3,812

Commits on Jan 20, 2021

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