[Snyk] Security upgrade mocha from 5.2.0 to 6.2.3#8

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-451a8c8226343d1ab17814b1b51b251f

+591-13

Commits on Aug 11, 2020

fix: deps/v8/tools/turbolizer/package.json & deps/v8/tools/turbolizer/package-lock.json to reduce vulnerabilities
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