[Snyk] Security upgrade gatsby from 1.9.279 to 3.13.0#855

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-63f9fe87f0d511c7c6175a35edba4a12

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Commits on Sep 12, 2021

fix: examples/using-emotion-prismjs/package.json to reduce vulnerabilities
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