[Snyk] Security upgrade copy-webpack-plugin from 4.6.0 to 6.0.0#116

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-968afb3598a0f3006aaa7b1dd9bfa925

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Commits on Jun 1, 2020

fix: app/polymer/package.json to reduce vulnerabilities
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