⬇️(frontend) downgrading fetch-mock to 9.11.0

fetch-mock relesed the version 10, but it is
causing some issues in the frontend tests for
the moment. The adoption is still low, the
documentation is not updated, so let's
downgrade it to 9.11.0 for now.

src/frontend/apps/desk/package.json

@@ -49,7 +49,7 @@
     "@types/react-dom": "*",
     "dotenv": "16.4.5",
     "eslint-config-people": "*",
-    "fetch-mock": "10.0.6",
+    "fetch-mock": "9.11.0",
     "jest": "29.7.0",
     "jest-environment-jsdom": "29.7.0",
     "node-fetch": "2.7.0",