[Snyk] Security upgrade gatsby from 2.26.1 to 2.31.0#340

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-810c1dab595baacaff07291f6b2d9cde

+2,643-1,283

Commits on Jan 19, 2021

fix: starters/gatsby-starter-mdx-basic/package.json & starters/gatsby-starter-mdx-basic/package-lock.json to reduce vulnerabilities
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