Update minor devDeps

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	10.1.0 -> 10.2.1
postcss (source)	8.2.2 -> 8.2.4
webpack	4.44.2 -> 4.45.0

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Release Notes

postcss/autoprefixer

### [`v10.2.1`](https://togithub.com/postcss/autoprefixer/blob/master/CHANGELOG.md#​1021) [Compare Source](https://togithub.com/postcss/autoprefixer/compare/10.2.0...10.2.1) - Fixed `transition-property` warnings (by [@​Sheraff](https://togithub.com/Sheraff)). ### [`v10.2.0`](https://togithub.com/postcss/autoprefixer/releases/10.2.0) [Compare Source](https://togithub.com/postcss/autoprefixer/compare/10.1.0...10.2.0) Autoprefixer 10.2 now has built-in TypeScript definitions. You do not need `@types/autoprefixer` anymore. Thanks to [@​Semigradsky](https://togithub.com/Semigradsky) and DefinitelyTyped’s contributors. [@​Sheraff](https://togithub.com/Sheraff) also improved docs.

postcss/postcss

### [`v8.2.4`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​824) [Compare Source](https://togithub.com/postcss/postcss/compare/8.2.3...8.2.4) - Added plugin name to `postcss.plugin()` warning (by Tom Williams). - Fixed docs (by Bill Columbia). ### [`v8.2.3`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#​823) [Compare Source](https://togithub.com/postcss/postcss/compare/8.2.2...8.2.3) - Fixed `JSON.stringify(Node[])` support (by Niklas Mischkulnig).

webpack/webpack

### [`v4.45.0`](https://togithub.com/webpack/webpack/releases/v4.45.0) [Compare Source](https://togithub.com/webpack/webpack/compare/v4.44.2...v4.45.0) ##### Features - resolve server-relative requests relative to project context by default ##### Bugfixes - fix a bug where `splitChunk` `minSize` is not handled correctly - fix a bug where the order of `splitChunk` `cacheGroups` is not handled correctly

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