build(deps): update dependency postcss to ^8.4.47 (#4536)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/)
([source](https://redirect.github.com/postcss/postcss)) | [`^8.4.45` ->
`^8.4.47`](https://renovatebot.com/diffs/npm/postcss/8.4.45/8.4.47) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.4.47?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss/8.4.47?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.4.45/8.4.47?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.4.45/8.4.47?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.4.47`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8447)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.4.46...8.4.47)

-   Removed debug code.

###
[`v8.4.46`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8446)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.4.45...8.4.46)

-   Fixed `Cannot read properties of undefined (reading 'before')`.

</details>

---

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apps/web/package.json

@@ -45,7 +45,7 @@
     "@types/react-dom": "^18.3.0",
     "eslint": "~8.57.0",
     "jest": "^29.7.0",
-    "postcss": "^8.4.45",
+    "postcss": "^8.4.47",
     "postcss-load-config": "^6.0.1",
     "rehype-external-links": "^3.0.0",
     "remark-gfm": "^4.0.0",