bump(deps): update dependency postcss to ^8.4.31

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.4.28 -> ^8.4.31

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Release Notes

postcss/postcss (postcss)

### [`v8.4.31`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8431) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.30...8.4.31) - Fixed `\r` parsing to fix CVE-2023-44270.

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