chore(deps): update dependency postcss to ^8.4.39

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.4.21 -> ^8.4.39

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Release Notes

postcss/postcss (postcss)

v8.4.39

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• Fixed CssSyntaxError types (by @​romainmenke).

v8.4.38

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• Fixed endIndex: 0 in errors and warnings (by @​romainmenke).

v8.4.37

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• Fixed original.column are not numbers error in another case.

v8.4.36

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• Fixed original.column are not numbers error on broken previous source map.

v8.4.35

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• Avoid ! in node.parent.nodes type.
• Allow to pass undefined to node adding method to simplify types.

v8.4.34

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• Fixed AtRule#nodes type (by Tim Weißenfels).
• Cleaned up code (by Dmitry Kirillov).

v8.4.33

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• Fixed NoWorkResult behavior difference with normal mode (by Romain Menke).
• Fixed NoWorkResult usage conditions (by @​ahmdammarr).

v8.4.32

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• Fixed postcss().process() types (by Andrew Ferreira).

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

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• Fixed Plugin types.

v8.4.23

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• Fixed warnings in TypeDoc.

v8.4.22

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• Fixed TypeScript support with node16 (by Remco Haszing).

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