chore(deps): update dependency postcss to v8.5.6

[renovate]

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This notice will be removed on 2025-10-07.

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This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.4.49 -> 8.5.6

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Release Notes

postcss/postcss (postcss)

v8.5.6

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• Fixed ContainerWithChildren type discriminating (by @​Goodwine).

v8.5.5

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• Fixed package.json→exports compatibility with some tools (by @​JounQin).

v8.5.4

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• Fixed Parcel compatibility issue (by @​git-sumitchaudhary).

v8.5.3

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• Added more details to Unknown word error (by @​hiepxanh).
• Fixed types (by @​romainmenke).
• Fixed docs (by @​catnipan).

v8.5.2

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• Fixed end position of rules with semicolon (by @​romainmenke).

v8.5.1

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• Fixed backwards compatibility for complex cases (by @​romainmenke).

v8.5.0: 8.5 “Duke Alloces”

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PostCSS 8.5 brought API to work better with non-CSS sources like HTML, Vue.js/Svelte sources or CSS-in-JS.

@​romainmenke during his work on Stylelint added Input#document in additional to Input#css.

root.source.input.document //=> "<p>Hello</p>
                           //    <style>
                           //    p {
                           //      color: green;
                           //    }
                           //    </style>"
root.source.input.css      //=> "p {
                           //      color: green;
                           //    }"

Thanks to Sponsors

This release was possible thanks to our community.

If your company wants to support the sustainability of front-end infrastructure or wants to give some love to PostCSS, you can join our supporters by:

• Tidelift with a Spotify-like subscription model supporting all projects from your lock file.
• Direct donations at GitHub Sponsors or Open Collective.

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