[Snyk] Security upgrade gatsby from 2.15.6 to 2.31.0#80

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-37449ac459553b1cdaa2ea1bec893675

+8,653-5,377

Commits on Sep 5, 2021

fix: examples/gatsby-hot-reload/package.json & examples/gatsby-hot-reload/package-lock.json to reduce vulnerabilities
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