[Snyk] Security upgrade gulp-autoprefixer from 4.1.0 to 6.0.0#16

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snyk-bot wants to merge 1 commit intomercuryfrom snyk-fix-b43673d8510b0c6cbf80b23b1b7793b6

+87-30

Commits on Jun 19, 2021

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