[Snyk] Security upgrade gatsby from 1.9.279 to 2.23.20#539

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-2e228baae6340b2a1e5fe8d87adc59be

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Commits on Aug 10, 2020

fix: examples/using-page-transitions/package.json to reduce vulnerabilities
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