[Snyk] Security upgrade postcss-loader from 3.0.0 to 4.0.0#1812

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saurabharch wants to merge 1 commit intomasterfrom snyk-fix-ab7758637587692ec684f8cbf70919f1

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Commits on Dec 25, 2022

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