fix: update dependency postcss to v8.2.12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.2.10 -> 8.2.12

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Release Notes

postcss/postcss

### [`v8.2.12`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​8212) [Compare Source](https://togithub.com/postcss/postcss/compare/8.2.11...8.2.12) - Fixed `package.json` exports. ### [`v8.2.11`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​8211) [Compare Source](https://togithub.com/postcss/postcss/compare/8.2.10...8.2.11) - Fixed `DEP0148` warning in Node.js 16. - Fixed docs (by [@​semiromid](https://togithub.com/semiromid)).

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