fix(deps): update dependency postcss to ^8.5.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.4.49 -> ^8.5.1

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Release Notes

postcss/postcss (postcss)

v8.5.1

Compare Source

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

v8.5.0: 8.5 “Duke Alloces”

Compare Source

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;
                           //    }"

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[mrdavidburns]

Minor release. All checks pass.