Bump postcss from 8.5.9 to 8.5.12

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.9 to 8.5.12.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.9...8.5.12)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.12
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "autoprefixer": "^10.5.0",
     "esbuild": "0.28.0",
     "jsdom": "^29.0.2",
-    "postcss": "^8.5.9",
+    "postcss": "^8.5.12",
     "regenerator-runtime": "^0.14.1",
     "sass": "^1.99.0",
     "snazzy": "^9.0.0",