[Snyk] Security upgrade npm from 6.2.0 to 6.6.0#520

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-42b8698fc81fd60e28c3d7fda9f2d61f

+707-405

Commits on Apr 16, 2021

fix: script/package.json & script/package-lock.json to reduce vulnerabilities
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