Bump postcss in /frontend in the npm_and_yarn group across 1 directory

Bumps the npm_and_yarn group with 1 update in the /frontend directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.8 to 8.5.10
- [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/8.5.8...8.5.10)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.10
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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

frontend/package.json

@@ -61,7 +61,7 @@
     "eslint": "^9.17.0",
     "eslint-plugin-react-hooks": "^5.1.0",
     "jsdom": "^25.0.0",
-    "postcss": "^8.5.6",
+    "postcss": "^8.5.10",
     "prettier": "^3.4.2",
     "tailwindcss": "^3.4.19",
     "typescript": "^5.6.3",