Bump next-themes from 0.2.1 to 0.4.6 in /frontend

Bumps [next-themes](https://github.com/pacocoursey/next-themes) from 0.2.1 to 0.4.6.
- [Release notes](https://github.com/pacocoursey/next-themes/releases)
- [Commits](https://github.com/pacocoursey/next-themes/commits/v0.4.6)

---
updated-dependencies:
- dependency-name: next-themes
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -24,7 +24,7 @@
     "framer-motion": "^11.11.7",
     "intl-messageformat": "^10.5.14",
     "next": "^14.2.25",
-    "next-themes": "^0.2.1",
+    "next-themes": "^0.4.6",
     "postcss": "8.4.47",
     "react": "18.3.1",
     "react-dom": "18.3.1",