Update dependency postcss to v8.5.3 (#34839)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [postcss](https://postcss.org/) ([source](https://redirect.github.com/postcss/postcss)) | dependencies | minor | [`8.4.49` -> `8.5.3`](https://renovatebot.com/diffs/npm/postcss/8.4.49/8.5.3) |

---

### Release Notes

<details>
<summary>postcss/postcss (postcss)</summary>

### [`v8.5.3`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#853)

[Compare Source](https://redirect.github.com/postcss/postcss/compare/8.5.2...8.5.3)

-   Added more details to `Unknown word` error (by [@&#8203;hiepxanh](https://redirect.github.com/hiepxanh)).
-   Fixed types (by [@&#8203;romainmenke](https://redirect.github.com/romainmenke)).
-   Fixed docs (by [@&#8203;catnipan](https://redirect.github.com/catnipan)).

### [`v8.5.2`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#852)

[Compare Source](https://redirect.github.com/postcss/postcss/compare/8.5.1...8.5.2)

-   Fixed end position of rules with semicolon (by [@&#8203;romainmenke](https://redirect.github.com/romainmenke)).

### [`v8.5.1`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#851)

[Compare Source](https://redirect.github.com/postcss/postcss/compare/8.5.0...8.5.1)

-   Fixed backwards compatibility for complex cases (by [@&#8203;romainmenke](https://redirect.github.com/romainmenke)).

### [`v8.5.0`](https://redirect.github.com/postcss/postcss/releases/tag/8.5.0): 8.5 “Duke Alloces”

[Compare Source](https://redirect.github.com/postcss/postcss/compare/8.4.49...8.5.0)

<img src="https://github.com/user-attachments/assets/6ef654a0-d675-4ba0-a670-e28ef27062f5" align="right" width="200" height="200" alt="President Alloces seal">

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

[@&#8203;romainmenke](https://redirect.github.com/romainmenke) during [his work](https://redirect.github.com/postcss/postcss/issues/1995) on [Stylelint](https://stylelint.io) added `Input#document` in additional to `Input#css`.

```js
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**](https://tidelift.com/) with a Spotify-like subscription model supporting all projects from your lock file.
-   Direct donations at [**GitHub Sponsors**](https://redirect.github.com/sponsors/ai) or [**Open Collective**](https://opencollective.com/postcss#section-contributors).

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "on the first day of the month" in timezone America/Los_Angeles, Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://redirect.github.com/renovatebot/renovate).

GitOrigin-RevId: 5c2a0c41e981d990df96db927a646a7235e1111f

Author: convex-renovate-runner[bot]

npm-packages/private-demos/quickstarts/nextjs-app-dir-14/package.json

@@ -18,7 +18,7 @@
     "eslint": "8.57.1",
     "eslint-config-next": "14.2.25",
     "next": "14.2.25",
-    "postcss": "8.4.49",
+    "postcss": "8.5.3",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "tailwindcss": "^3.2.4",

npm-packages/private-demos/quickstarts/nextjs-app-dir-js/package.json

@@ -14,7 +14,7 @@
     "eslint": "8.57.1",
     "eslint-config-next": "14.2.25",
     "next": "14.2.25",
-    "postcss": "8.4.49",
+    "postcss": "8.5.3",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "tailwindcss": "3.4.17"

npm-packages/private-demos/quickstarts/nextjs/package.json

@@ -14,7 +14,7 @@
     "eslint": "8.57.1",
     "eslint-config-next": "14.2.25",
     "next": "14.2.26",
-    "postcss": "8.4.49",
+    "postcss": "8.5.3",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "tailwindcss": "3.4.17"