Bump fetch-mock from 11.1.5 to 12.1.0 in /webui

Bumps [fetch-mock](https://github.com/wheresrhys/fetch-mock/tree/HEAD/packages/fetch-mock) from 11.1.5 to 12.1.0.
- [Release notes](https://github.com/wheresrhys/fetch-mock/releases)
- [Changelog](https://github.com/wheresrhys/fetch-mock/blob/main/packages/fetch-mock/CHANGELOG.md)
- [Commits](https://github.com/wheresrhys/fetch-mock/commits/fetch-mock-v12.1.0/packages/fetch-mock)

---
updated-dependencies:
- dependency-name: fetch-mock
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

webui/package.json

@@ -39,7 +39,7 @@
         "eslint-config-next": "~14.2.7",
         "eslint-plugin-cypress": "^3.5.0",
         "eslint-plugin-jest": "^28.6.0",
-        "fetch-mock": "^11.1.5",
+        "fetch-mock": "^12.1.0",
         "jest": "^29.7.0",
         "jest-environment-jsdom": "^29.7.0",
         "postcss": "^8",