[Snyk] Security upgrade gatsby from 2.24.79 to 2.31.0#31

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d3f91ce46b62ca42dcb2a413e68236ce

+3,457-3,354

Commits on Jan 19, 2021

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