chore(deps): update dependency postcss to v8.4.20

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	`8.4.18` -> `8.4.20`

Release Notes

postcss/postcss

### [`v8.4.20`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8420) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.19...8.4.20) - Fixed source map generation for childless at-rules like `@layer`. ### [`v8.4.19`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8419) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.18...8.4.19) - Fixed whitespace preserving after AST transformations (by Romain Menke).

Configuration

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notrab / headless-dropshipping-starter

chore(deps): update dependency postcss to v8.4.20 #89

Release Notes

Configuration