Bump postcss from 8.5.1 to 8.5.3

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.1 to 8.5.3.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.1...8.5.3)

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

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

package.json

@@ -36,7 +36,7 @@
     "jquery": "^3.7.1",
     "normalize.css": "^8.0.0",
     "popper.js": "^1.16.1",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.3",
     "preact": "^10.25.4",
     "rollup": "^4.30.0",
     "sass": "^1.83.4",

yarn.lock

@@ -6397,7 +6397,7 @@ __metadata:
     mocha: ^11.0.1
     normalize.css: ^8.0.0
     popper.js: ^1.16.1
-    postcss: ^8.5.1
+    postcss: ^8.5.3
     preact: ^10.25.4
     prettier: ^3.4.1
     rollup: ^4.30.0
@@ -9189,14 +9189,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.5.1":
-  version: 8.5.1
-  resolution: "postcss@npm:8.5.1"
+"postcss@npm:^8.5.3":
+  version: 8.5.3
+  resolution: "postcss@npm:8.5.3"
   dependencies:
     nanoid: ^3.3.8
     picocolors: ^1.1.1
     source-map-js: ^1.2.1
-  checksum: cfdcfcd019fca78160341080ba8986cf80cd6e9ca327ba61b86c03e95043e9bce56ad2e018851858039fd7264781797360bfba718dd216b17b3cd803a5134f2f
+  checksum: da574620eb84ff60e65e1d8fc6bd5ad87a19101a23d0aba113c653434161543918229a0f673d89efb3b6d4906287eb04b957310dbcf4cbebacad9d1312711461
   languageName: node
   linkType: hard