Update minor devDeps

[renovate]

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

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• Fixed transition-property warnings (by @​Sheraff).

v10.2.0

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Autoprefixer 10.2 now has built-in TypeScript definitions. You do not need @types/autoprefixer anymore.

Thanks to @​Semigradsky and DefinitelyTyped’s contributors.

@​Sheraff also improved docs.

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).

webpack/webpack

v4.45.0

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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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