chore: bump @reduxjs/toolkit from 2.2.5 to 2.2.6 in /frontend/web (#212)

Bumps [@reduxjs/toolkit](https://github.com/reduxjs/redux-toolkit) from 2.2.5 to 2.2.6.
- [Release notes](https://github.com/reduxjs/redux-toolkit/releases)
- [Commits](https://github.com/reduxjs/redux-toolkit/compare/v2.2.5...v2.2.6)

---
updated-dependencies:
- dependency-name: "@reduxjs/toolkit"
  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/web/package.json

@@ -12,7 +12,7 @@
     "@emotion/react": "^11.11.4",
     "@emotion/styled": "^11.11.5",
     "@mui/joy": "5.0.0-beta.36",
-    "@reduxjs/toolkit": "^2.2.5",
+    "@reduxjs/toolkit": "^2.2.6",
     "classnames": "^2.5.1",
     "copy-to-clipboard": "^3.3.3",
     "dayjs": "^1.11.10",