[Snyk] Security upgrade yargs from 4.8.1 to 16.0.0#3

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snyk-fix-4feae33befb95d7385917438471ca2a7

Commits on Nov 18, 2020

fix: test/WasmSpec/convert-test-suite/package.json & test/WasmSpec/convert-test-suite/package-lock.json to reduce vulnerabilities
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