[Snyk] Security upgrade gulp-autoprefixer from 3.1.1 to 6.0.0#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-dc619c0ed7b21b0df3ca890184849fb4

+348-1,178

Commits on Jun 19, 2021

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