chore(deps): update dependency postcss to ^8.2.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.1.6 -> ^8.2.4

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Release Notes

postcss/postcss

v8.2.4

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• Added plugin name to postcss.plugin() warning (by Tom Williams).
• Fixed docs (by Bill Columbia).

v8.2.3

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• Fixed JSON.stringify(Node[]) support (by Niklas Mischkulnig).

v8.2.2

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• Fixed CSS-in-JS support (by James Garbutt).
• Fixed plugin types (by Ludovico Fischer).
• Fixed Result#warn() types.

v8.2.1

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• Fixed Node#toJSON() and postcss.fromJSON() (by Niklas Mischkulnig).

v8.2.0

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PostCSS 8.2 added a new API to serialize and deserialize CSS AST to JSON.

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 for his work.

v8.1.14

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• Fixed parser performance regression.

v8.1.13

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• Fixed broken AST after moving nodes in visitor API.

v8.1.12

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• Fixed Autoprefixer regression.

v8.1.11

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• Added PostCSS update suggestion on unknown event in plugin.

v8.1.10

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• Fixed LazyResult type export (by Evan You).
• Fixed LazyResult type compatibility with Promise (by Anton Kastritskiy).

v8.1.9

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• Reduced dependencies number (by Bogdan Chadkin).

v8.1.8

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• Fixed LazyResult type compatibility with Promise (by Ludovico Fischer).
• Fixed HTTPS links in documentation.

v8.1.7

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• Fixed import support in TypeScript (by Remco Haszing).

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