Update CSS preprocessors

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	10.4.19 -> 10.4.20
postcss (source)	8.4.38 -> 8.4.47

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Release Notes

postcss/autoprefixer (autoprefixer)

v10.4.20

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• Fixed fit-content prefix for Firefox.

postcss/postcss (postcss)

v8.4.47

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• Removed debug code.

v8.4.46

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• Fixed Cannot read properties of undefined (reading 'before').

v8.4.45

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• Removed unnecessary fix which could lead to infinite loop.

v8.4.44

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• Another way to fix markClean is not a function error.

v8.4.43

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• Fixed markClean is not a function error.

v8.4.42

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• Fixed CSS syntax error on long minified files (by @​varpstar).

v8.4.41

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• Fixed types (by @​nex3 and @​querkmachine).
• Cleaned up RegExps (by @​bluwy).

v8.4.40

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• Moved to getter/setter in nodes types to help Sass team (by @​nex3).

v8.4.39

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• Fixed CssSyntaxError types (by @​romainmenke).

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