[Snyk] Security upgrade gulp from 3.9.1 to 4.0.0#19

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snyk-bot wants to merge 1 commit intomercuryfrom snyk-fix-4496e5c495ac4479901b2392bd6c6046

+2,216-681

Commits on Oct 20, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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