build(deps): update dependency postcss to v8.4.49 (#10788)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/)
([source](https://redirect.github.com/postcss/postcss)) | [`8.4.47` ->
`8.4.49`](https://renovatebot.com/diffs/npm/postcss/8.4.47/8.4.49) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.4.49?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss/8.4.49?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.4.47/8.4.49?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.4.47/8.4.49?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.4.49`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8449)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.4.48...8.4.49)

- Fixed custom syntax without `source.offset` (by
[@&#8203;romainmenke](https://redirect.github.com/romainmenke)).

###
[`v8.4.48`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8448)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.4.47...8.4.48)

- Fixed position calculation in error/warnings methods (by
[@&#8203;romainmenke](https://redirect.github.com/romainmenke)).

</details>

---

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package.json

@@ -103,7 +103,7 @@
     "lerna": "8.1.8",
     "lint-staged": "15.2.10",
     "markdownlint-cli": "0.42.0",
-    "postcss": "8.4.47",
+    "postcss": "8.4.49",
     "prettier": "3.3.3",
     "puppeteer": "23.4.1",
     "quicktype-core": "23.0.170",