chore(deps-dev): bump postcss from 8.5.14 to 8.5.18

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.14 to 8.5.18.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.14...8.5.18)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.18
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/domscribe-test-fixtures/styling/tailwind-app/package.json

@@ -16,7 +16,7 @@
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
-    "postcss": "^8.4.49",
+    "postcss": "^8.5.18",
     "tailwindcss": "^3.4.17",
     "typescript": "^5.6.3",
     "vite": "^5.4.11"