build(deps): bump postcss from 8.4.31 to 8.4.47 in /frontend (#58)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.31 to 8.4.47.
- [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/8.4.31...8.4.47)

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

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

frontend/package.json

@@ -29,7 +29,7 @@
     "next": "^14.2.13",
     "next-intl": "^3.12.0",
     "next-themes": "^0.2.1",
-    "postcss": "8.4.31",
+    "postcss": "8.4.47",
     "react": "^18.3.1",
     "react-apexcharts": "^1.4.1",
     "react-dom": "18.2.0",