chore(deps): update dependency postcss to v8.4.18

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	`8.4.16` -> `8.4.18`

Release Notes

postcss/postcss

### [`v8.4.18`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8418) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.17...8.4.18) - Fixed an error on `absolute: true` with empty `sourceContent` (by Rene Haas). ### [`v8.4.17`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8417) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.16...8.4.17) - Fixed `Node.before()` unexpected behavior (by Romain Menke). - Added TOC to docs (by Mikhail Dedov).

Configuration

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notrab / headless-dropshipping-starter

chore(deps): update dependency postcss to v8.4.18 #84

Release Notes

Configuration