build: update postcss to version 8.2.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.2.3 -> 8.2.4

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Release Notes

postcss/postcss

v8.2.4

Compare Source

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

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