build(deps): update dependency postcss to v8.4.28 (#7544)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/)
([source](https://github.com/postcss/postcss)) | [`8.4.21` ->
`8.4.28`](https://renovatebot.com/diffs/npm/postcss/8.4.21/8.4.28) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.4.28?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss/8.4.28?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.4.21/8.4.28?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.4.21/8.4.28?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.4.28`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8428)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.27...8.4.28)

-   Fixed `Root.source.end` for better source map (by Romain Menke).
-   Fixed `Result.root` types when `process()` has no parser.

###
[`v8.4.27`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8427)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.26...8.4.27)

-   Fixed `Container` clone methods types.

###
[`v8.4.26`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8426)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.25...8.4.26)

-   Fixed clone methods types.

###
[`v8.4.25`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8425)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.24...8.4.25)

-   Improve stringify performance (by Romain Menke).
- Fixed docs (by
[@&#8203;vikaskaliramna07](https://github.com/vikaskaliramna07)).

###
[`v8.4.24`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8424)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.23...8.4.24)

-   Fixed `Plugin` types.

###
[`v8.4.23`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8423)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.22...8.4.23)

-   Fixed warnings in TypeDoc.

###
[`v8.4.22`](https://github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8422)

[Compare
Source](https://github.com/postcss/postcss/compare/8.4.21...8.4.22)

-   Fixed TypeScript support with `node16` (by Remco Haszing).

</details>

---

### Configuration

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---

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package.json

@@ -80,7 +80,7 @@
     "lerna": "7.1.5",
     "lint-staged": "13.2.3",
     "markdownlint-cli": "0.34.0",
-    "postcss": "8.4.21",
+    "postcss": "8.4.28",
     "prettier": "2.8.8",
     "puppeteer": "10.0.0",
     "quicktype-core": "23.0.48",