Update dependency postcss to v8.4.40 (#2316)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/) ([source](https://togithub.com/postcss/postcss)) | [`8.4.39` -> `8.4.40`](https://renovatebot.com/diffs/npm/postcss/8.4.38/8.4.40) | [![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.4.40?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss/8.4.40?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.4.38/8.4.40?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.4.38/8.4.40?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v8.4.40`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8440)

[Compare Source](https://togithub.com/postcss/postcss/compare/8.4.39...8.4.40)

-   Moved to getter/setter in nodes types to help Sass team (by [@&#8203;nex3](https://togithub.com/nex3)).

### [`v8.4.39`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8439)

[Compare Source](https://togithub.com/postcss/postcss/compare/8.4.38...8.4.39)

-   Fixed `CssSyntaxError` types (by [@&#8203;romainmenke](https://togithub.com/romainmenke)).

</details>

---

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package.json

@@ -178,7 +178,7 @@
     "playwright-chromium": "1.45.2",
     "playwright-core": "1.45.2",
     "plop": "4.0.1",
-    "postcss": "8.4.39",
+    "postcss": "8.4.40",
     "postcss-nested": "6.2.0",
     "postcss-pseudoelements": "5.0.0",
     "postcss-short-size": "4.0.0",

packages/next/package.json

@@ -93,7 +93,7 @@
     "@swc/helpers": "0.5.12",
     "busboy": "1.6.0",
     "caniuse-lite": "^1.0.30001406",
-    "postcss": "8.4.39",
+    "postcss": "8.4.40",
     "styled-jsx": "5.1.6",
     "watchpack": "2.4.1",
     "zod": "3.23.8"