[Snyk] Security upgrade postcss-cssnext from 2.11.0 to 3.0.0#30

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bertrandk wants to merge 1 commit intomasterfrom snyk-fix-5d57e516669045b4a4bf40396ef8a6ea

+1-1

Commits on Mar 13, 2021

fix: packages/react-scripts/package.json to reduce vulnerabilities
snyk-bot
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