chore(deps): update dependency postcss to v8.5.31 (#1608)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [postcss](https://postcss.org/)
([source](https://redirect.github.com/postcss/postcss)) | [`8.5.30` →
`8.5.31`](https://renovatebot.com/diffs/npm/postcss/8.5.30/8.5.31) |
![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.5.31?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.5.30/8.5.31?slim=true)
|

---

### Release Notes

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

###
[`v8.5.31`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8531)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.5.30...8.5.31)

- Fix better source map on `</style>` escaping (by
[@&#8203;firefoxic](https://redirect.github.com/firefoxic)).

</details>

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yarn.lock

@@ -15666,13 +15666,13 @@ __metadata:
   linkType: hard
 
 "postcss@npm:^8.4.21, postcss@npm:^8.4.24, postcss@npm:^8.4.33, postcss@npm:^8.4.45, postcss@npm:^8.4.47, postcss@npm:^8.5.10, postcss@npm:^8.5.4":
-  version: 8.5.30
-  resolution: "postcss@npm:8.5.30"
+  version: 8.5.31
+  resolution: "postcss@npm:8.5.31"
   dependencies:
     nanoid: "npm:^3.3.20"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.2"
-  checksum: 10c0/219cdc50ba3f2b6d0f8b779c4939514cb9d9f53cc9eb92dae1a06f2d6eb910b2ce339a3ee93e7c893b89e50241509fd92c04f0639af1cdf41a1e13983a476029
+  checksum: 10c0/52f94c6655f86f568a803ce9c8eb3c749e109cc711d26644c4cde953b30c1b947a2f25af3b9453de68584ac655572f46ed8e830b8ab2f21dd226b3f640992e00
   languageName: node
   linkType: hard