Bump postcss from 8.4.24 to 8.4.25 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.24 to 8.4.25.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.24...8.4.25)

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

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

frontend/package.json

@@ -127,7 +127,7 @@
     "jest": "29.4.1",
     "jest-environment-jsdom": "29.5.0",
     "lint-staged": "13.2.2",
-    "postcss": "8.4.24",
+    "postcss": "8.4.25",
     "postcss-syntax": "0.36.2",
     "prettier": "2.8.8",
     "react-testing-library": "8.0.1",