chore(deps-dev): bump postcss in /packages/frontend (#69)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.13 to 8.5.14.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.13...8.5.14)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.14
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/frontend/package-lock.json

@@ -41,7 +41,7 @@
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.6.0",
     "jsdom": "^29.1.1",
-    "postcss": "^8.5.13",
+    "postcss": "^8.5.14",
     "tailwindcss": "^4.3.0",
     "typescript": "~6.0.3",
     "typescript-eslint": "^8.59.2",