fix(deps): update dependency postcss to v8.4.31

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.23 -> 8.4.31

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Release Notes

postcss/postcss

v8.4.31

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• Fixed \r parsing to fix CVE-2023-44270.

v8.4.30

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• Improved source map performance (by Romain Menke).

v8.4.29

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• Fixed Node#source.offset (by Ido Rosenthal).
• Fixed docs (by Christian Oliff).

v8.4.28

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

v8.4.27

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• Fixed Container clone methods types.

v8.4.26

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• Fixed clone methods types.

v8.4.25

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• Improve stringify performance (by Romain Menke).
• Fixed docs (by @​vikaskaliramna07).

v8.4.24

Compare Source

• Fixed Plugin types.

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