[Snyk] Security upgrade postcss-loader from 3.0.0 to 4.0.0#523

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-5d5585d4c38857a0fc6811517b786f27

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Commits on Apr 13, 2021

fix: packages/gatsby-plugin-postcss/package.json to reduce vulnerabilities
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