chore(deps): ⬆️ Update devDependency postcss to v8.4.28

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.26 -> 8.4.28

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Release Notes

postcss/postcss (postcss)

v8.4.28

Compare Source

• Fixed Root.source.end for better source map (by Romain Menke).
• Fixed Result.root types when process() has no parser.

v8.4.27

Compare Source

• Fixed Container clone methods types.

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Configuration

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