[Snyk] Security upgrade postcss-loader from 3.0.0 to 4.0.0#1600

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ajesse11x wants to merge 1 commit intomasterfrom snyk-fix-a6eb6deba1dacba3b083460156789935

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Commits on Nov 5, 2022

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