[Snyk] Security upgrade gatsby from 2.15.6 to 4.0.0#97

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-3b30c28032be26ef5cb0ee174766ba0e

+8,577-10,175

Commits on Jan 25, 2022

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