[Snyk] Security upgrade yargs from 11.1.1 to 16.0.0#457

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-3cdb8affddcee79299e18a3c0cf23735

+1-1

Commits on Nov 18, 2020

fix: packages/gatsby-cli/package.json to reduce vulnerabilities
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