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

@@ -16,7 +16,7 @@
     "concurrently": "^9.1.2",
     "eleventy-plugin-reading-time": "^0.0.1",
     "markdown-it-prism": "^3.0.0",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.4",
     "tailwindcss": "4.1.5"
   },
   "packageManager": "yarn@4.0.2"

yarn.lock

@@ -1184,7 +1184,7 @@ __metadata:
     concurrently: "npm:^9.1.2"
     eleventy-plugin-reading-time: "npm:^0.0.1"
     markdown-it-prism: "npm:^3.0.0"
-    postcss: "npm:^8.5.3"
+    postcss: "npm:^8.5.4"
     tailwindcss: "npm:4.1.5"
   languageName: unknown
   linkType: soft
@@ -2203,6 +2203,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nanoid@npm:^3.3.11":
+  version: 3.3.11
+  resolution: "nanoid@npm:3.3.11"
+  bin:
+    nanoid: bin/nanoid.cjs
+  checksum: 40e7f70b3d15f725ca072dfc4f74e81fcf1fbb02e491cf58ac0c79093adc9b0a73b152bcde57df4b79cd097e13023d7504acb38404a4da7bc1cd8e887b82fe0b
+  languageName: node
+  linkType: hard
+
 "nanoid@npm:^3.3.8":
   version: 3.3.8
   resolution: "nanoid@npm:3.3.8"
@@ -2385,14 +2394,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.5.3":
-  version: 8.5.3
-  resolution: "postcss@npm:8.5.3"
+"postcss@npm:^8.5.4":
+  version: 8.5.4
+  resolution: "postcss@npm:8.5.4"
   dependencies:
-    nanoid: "npm:^3.3.8"
+    nanoid: "npm:^3.3.11"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: b75510d7b28c3ab728c8733dd01538314a18c52af426f199a3c9177e63eb08602a3938bfb66b62dc01350b9aed62087eabbf229af97a1659eb8d3513cec823b3
+  checksum: 0feff648614a834f7cd5396ea6b05b658ca0507e10a4eaad03b56c348f6aec93f42a885fc1b30522630c6a7e49ae53b38a061e3cba526f2d9857afbe095a22bb
   languageName: node
   linkType: hard