[Snyk] Security upgrade gatsby from 2.32.13 to 3.13.0#832

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-35c93f16edd470f2918af65b7fe7dca4

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Commits on Sep 1, 2021

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