chore(deps): update dependency postcss to v8.4.39 (#2334)

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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)) | [`8.4.38` ->
`8.4.39`](https://renovatebot.com/diffs/npm/postcss/8.4.38/8.4.39) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.4.39?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.4.38/8.4.39?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

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

###
[`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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yarn.lock

@@ -17059,13 +17059,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.0.0, postcss@npm:^8.4.32, postcss@npm:^8.4.33, postcss@npm:^8.4.35, postcss@npm:^8.4.38":
-  version: 8.4.38
-  resolution: "postcss@npm:8.4.38"
+  version: 8.4.39
+  resolution: "postcss@npm:8.4.39"
   dependencies:
     nanoid: "npm:^3.3.7"
-    picocolors: "npm:^1.0.0"
+    picocolors: "npm:^1.0.1"
     source-map-js: "npm:^1.2.0"
-  checksum: 10/6e44a7ed835ffa9a2b096e8d3e5dfc6bcf331a25c48aeb862dd54e3aaecadf814fa22be224fd308f87d08adf2299164f88c5fd5ab1c4ef6cbd693ceb295377f4
+  checksum: 10/ad9c1add892c96433b9a5502878201ede4a20c4ce02d056251f61f8d9a3e5426dab3683fe5a086edfa78a1a19f2b4988c8cea02c5122136d29758cb5a17e2621
   languageName: node
   linkType: hard