[Snyk] Security upgrade postcss-cssnext from 2.11.0 to 3.0.0#678

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harunpehlivan wants to merge 1 commit intomasterfrom snyk-fix-539baa583837816cb82e909d61460e27

+1-1

Commits on Mar 12, 2021

fix: packages/gatsby/package.json to reduce vulnerabilities
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