fix(deps): update dependency postcss to v8.5.4 (#1185)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/)
([source](https://redirect.github.com/postcss/postcss)) | [`8.5.3` ->
`8.5.4`](https://renovatebot.com/diffs/npm/postcss/8.5.3/8.5.4) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/postcss/8.5.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/postcss/8.5.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/postcss/8.5.3/8.5.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/postcss/8.5.3/8.5.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.5.4`](https://redirect.github.com/postcss/postcss/blob/HEAD/CHANGELOG.md#854)

[Compare
Source](https://redirect.github.com/postcss/postcss/compare/8.5.3...8.5.4)

- Fixed Parcel compatibility issue (by
[@&#8203;git-sumitchaudhary](https://redirect.github.com/git-sumitchaudhary)).

</details>

---

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yarn.lock

@@ -9177,7 +9177,7 @@ mz@^2.7.0:
     object-assign "^4.0.1"
     thenify-all "^1.0.0"
 
-nanoid@^3.3.8:
+nanoid@^3.3.11:
   version "3.3.11"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.11.tgz#4f4f112cefbe303202f2199838128936266d185b"
   integrity sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==
@@ -10360,11 +10360,11 @@ postcss-zindex@^6.0.2:
   integrity sha512-5BxW9l1evPB/4ZIc+2GobEBoKC+h8gPGCMi+jxsYvd2x0mjq7wazk6DrP71pStqxE9Foxh5TVnonbWpFZzXaYg==
 
 postcss@^8.4.21, postcss@^8.4.24, postcss@^8.4.26, postcss@^8.4.33, postcss@^8.4.38, postcss@^8.4.47, postcss@^8.5.2:
-  version "8.5.3"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.3.tgz#1463b6f1c7fb16fe258736cba29a2de35237eafb"
-  integrity sha512-dle9A3yYxlBSrt8Fu+IpjGT8SY8hN0mlaA6GY8t0P5PjIOZemULz/E2Bnm/2dcUOena75OTNkHI76uZBNUUq3A==
+  version "8.5.4"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.5.4.tgz#d61014ac00e11d5f58458ed7247d899bd65f99c0"
+  integrity sha512-QSa9EBe+uwlGTFmHsPKokv3B/oEMQZxfqW0QqNCyhpa6mB1afzulwn8hihglqAb2pOw+BJgNlmXQ8la2VeHB7w==
   dependencies:
-    nanoid "^3.3.8"
+    nanoid "^3.3.11"
     picocolors "^1.1.1"
     source-map-js "^1.2.1"