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

snyk-bot wants to merge 1 commit intomasterE-LLP/developer.github.com:masterfrom

snyk-fix-a72e5b12c8644e06349b1773dfedf5dfE-LLP/developer.github.com:snyk-fix-a72e5b12c8644e06349b1773dfedf5dfCopy head branch name to clipboard