Bump @reduxjs/toolkit from 2.2.1 to 2.6.0 in /frontend

Bumps [@reduxjs/toolkit](https://github.com/reduxjs/redux-toolkit) from 2.2.1 to 2.6.0.
- [Release notes](https://github.com/reduxjs/redux-toolkit/releases)
- [Commits](reduxjs/redux-toolkit@v2.2.1...v2.6.0)

---
updated-dependencies:
- dependency-name: "@reduxjs/toolkit"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -13,7 +13,7 @@
     "now": "ENV=test jest specs/screens/home/sagas/getAll*.spec.js --maxWorkers=2"
   },
   "dependencies": {
-    "@reduxjs/toolkit": "^2.0.1",
+    "@reduxjs/toolkit": "^2.6.0",
     "axios": "^1.6.7",
     "axios-mock-adapter": "^1.22.0",
     "bootstrap": "^5.2.0",