[Snyk] Security upgrade copy-webpack-plugin from 4.6.0 to 5.0.0#231

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d6d50100acca5da28c2437a3467a9778

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Commits on Apr 16, 2021

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