[Snyk] Security upgrade gatsby from 2.32.13 to 3.13.0#790

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-0ddabf6f5a927d81964e325bfbc42453

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Commits on Aug 31, 2021

fix: examples/using-path-prefix/package.json to reduce vulnerabilities
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