[Snyk] Security upgrade @actions/core from 1.2.3 to 1.2.6#27

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-25fb28d30eb46de166f30e9ba786b482

Commits on Oct 3, 2020

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