[Snyk] Security upgrade gulp from 3.9.1 to 4.0.0#3

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a155f9a9474cdefca0e9f8ab0da44799

+1-1

Commits on Mar 11, 2020

fix: test/usageTests/package.json to reduce vulnerabilities
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