⬆️ Bump postcss to v8.5.28

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.15 → 8.5.28

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Release Notes

postcss/postcss (postcss)

v8.5.28

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• Fixes types regression.

v8.5.27

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• Fixed removing any comments starting with /*# (by @​dylanpulver).
• Fixed * hack before a comment in Custom Properties (by @​Jaybhade).
• Fixed empty values in the middle of list.comma() (by @​MahinAnowar).
• Fixed whitespace-only values in list.space() (by @​MahinAnowar).
• Fixed rule’s end position on space before semicolon (by @​maximilliangrand).
• Fixed types (by @​romainmenke).
• Fixed Chinese text in deprecation warning (by @​Jesse205).

v8.5.26

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• Fixed list.split() regression (by @​lazerg).
• Track symlinks in path protection in source map loading (by @​drengir1).

v8.5.25

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• Fixed 8.5.17 visitor regression.
• Fixed list.split() for non-string values (by @​amir-rezaei).

v8.5.24

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• Preserve the BOM after the processing (by @​hdimer).

v8.5.23

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• Do not load source map without opts.from for security reasons.

v8.5.22

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• Fixed custom property losing semicolon before a comment (by @​sarathfrancis90).

v8.5.21

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• Fixed childless at-rule losing semicolon before comment (by @​sarathfrancis90).
• Fixed docs (by @​isker).

v8.5.20

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• Fixed missing space if AtRule#params is set after (by @​sarathfrancis90).
• Fixed mixing AST error on warnings (by @​MahinAnowar).

v8.5.19

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• Fixed cleaning before for new nodes inserted to Root (by @​MahinAnowar).

v8.5.18

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• Restricted loading previous source maps file to the opts.from folder for security reasons (use unsafeMap: true to disable the check).

v8.5.17

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• Fixed Maximum call stack size exceeded error.
• Fixed Prototype hijacking for postcss.fromJSON().
• Fixed Input#origin() for unmapped end position (by @​chatman-media).

v8.5.16

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• Fixed Input#origin() position (by @​mizdra).
• Fixed raws after rehydrating a JSON AST (by @​sarathfrancis90).
• Fixed putting parent-less node in nodes of new node (by @​MahinAnowar).
• Fixed computing offset in positionBy() (by @​greymoth-jp).
• Fixed rangeBy() on index: 0 (by @​sarathfrancis90).

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: web/app/themes/wordpress-starter-template/package-lock.json

npm warn Unknown env config "store". This will error in a future major version of npm. See `npm help npmrc` for supported config options.
npm error code EALLOWREMOTE
npm error Fetching packages of type "remote" have been disabled
npm error Refusing to fetch "https://registry.npmjs.org/@tailwindcss/oxide-wasm32-wasi/-/oxide-wasm32-wasi-4.3.0.tgz"
npm error A complete log of this run can be found in: /runner/cache/others/npm/_logs/2026-09-15T12_45_27_066Z-debug-0.log