chore(deps): update dependency postcss to v8.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.1.14 -> 8.2.0

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Release Notes

postcss/postcss

### [`v8.2.0`](https://togithub.com/postcss/postcss/releases/8.2.0) [Compare Source](https://togithub.com/postcss/postcss/compare/8.1.14...8.2.0) PostCSS 8.2 added a new API to serialize and deserialize CSS AST to JSON. ```js import { parse, fromJSON } from 'postcss' let root = parse('a{}', { from: 'input.css' }) let json = root.toJSON() // save to file, send by network, etc let root2 = fromJSON(json) ``` Thanks to [@​mischnic](https://togithub.com/mischnic) for [his work](https://togithub.com/postcss/postcss/pull/1484).

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