[Snyk] Security upgrade gatsby from 2.26.1 to 2.31.0#348

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6a94e4f70cba2ced555b5d7d713d7106

+2,708-1,927

Commits on Jan 19, 2021

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