⬆️ bump: Bump date-fns from 4.1.0 to 4.2.1 in /frontend

Bumps [date-fns](https://github.com/date-fns/date-fns) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/date-fns/date-fns/releases)
- [Changelog](https://github.com/date-fns/date-fns/blob/v4.2.1/CHANGELOG.md)
- [Commits](date-fns/date-fns@v4.1.0...v4.2.1)

---
updated-dependencies:
- dependency-name: date-fns
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package.json

@@ -45,7 +45,7 @@
     "axios": "^1.16.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
-    "date-fns": "^4.1.0",
+    "date-fns": "^4.2.1",
     "lucide-react": "^1.16.0",
     "next-themes": "^0.4.6",
     "radix-ui": "^1.4.3",