Bump postcss from 8.5.3 to 8.5.8

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.3 to 8.5.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.5.3...8.5.8)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -51,7 +51,7 @@
     "@types/js-yaml": "4.0.9",
     "@types/lodash-es": "4.17.12",
     "jsdom": "27.1.0",
-    "postcss": "8.5.3",
+    "postcss": "8.5.8",
     "prettier": "3.8.1",
     "tailwindcss": "4.1.12",
     "typescript": "5.9.2",