[Snyk] Security upgrade gatsby from 2.15.6 to 2.20.21#45

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-92fc9e9ba140babb7f730cb8b98b48bf

+7,629-5,190

Commits on Dec 29, 2020

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