Update dependency postcss to v8.4.25

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.21 -> 8.4.25

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Release Notes

postcss/postcss (postcss)

### [`v8.4.25`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8425) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.24...8.4.25) - Improve stringify performance (by Romain Menke). - Fixed docs (by [@​vikaskaliramna07](https://togithub.com/vikaskaliramna07)). ### [`v8.4.24`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8424) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.23...8.4.24) - Fixed `Plugin` types. ### [`v8.4.23`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8423) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.22...8.4.23) - Fixed warnings in TypeDoc. ### [`v8.4.22`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8422) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.21...8.4.22) - Fixed TypeScript support with `node16` (by Remco Haszing).

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