Bump postcss from 8.5.3 to 8.5.4

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.3 to 8.5.4.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.3...8.5.4)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -79,7 +79,7 @@
     "gulp-changed": "^5.0.1",
     "katex": "^0.16.0",
     "playwright": "^1.51.1",
-    "postcss": "^8.0.3",
+    "postcss": "^8.5.4",
     "preact": "^10.4.0",
     "prettier": "3.5.3",
     "rollup": "^4.0.2",

yarn.lock

@@ -1680,7 +1680,7 @@ __metadata:
     gulp-changed: ^5.0.1
     katex: ^0.16.0
     playwright: ^1.51.1
-    postcss: ^8.0.3
+    postcss: ^8.5.4
     preact: ^10.4.0
     prettier: 3.5.3
     rollup: ^4.0.2
@@ -6412,7 +6412,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.3.8":
+"nanoid@npm:^3.3.11, nanoid@npm:^3.3.8":
   version: 3.3.11
   resolution: "nanoid@npm:3.3.11"
   bin:
@@ -7014,7 +7014,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.0.3, postcss@npm:^8.4.47, postcss@npm:^8.5.3":
+"postcss@npm:^8.4.47, postcss@npm:^8.5.3":
   version: 8.5.3
   resolution: "postcss@npm:8.5.3"
   dependencies:
@@ -7025,6 +7025,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"postcss@npm:^8.5.4":
+  version: 8.5.4
+  resolution: "postcss@npm:8.5.4"
+  dependencies:
+    nanoid: ^3.3.11
+    picocolors: ^1.1.1
+    source-map-js: ^1.2.1
+  checksum: 7ede5eb54aa56767a61541f13ca9994ce56d93340bc3c99328c741e5cc6c0024510e31667be108e3d29e5189d434ae8476c820e8c0ce90cf942d8a2faf1eb876
+  languageName: node
+  linkType: hard
+
 "preact@npm:^10.18.1, preact@npm:^10.4.0":
   version: 10.26.7
   resolution: "preact@npm:10.26.7"