Bump @fluentui/react from 8.112.5 to 8.121.11 in /app/frontend

Bumps [@fluentui/react](https://github.com/microsoft/fluentui) from 8.112.5 to 8.121.11.
- [Release notes](https://github.com/microsoft/fluentui/releases)
- [Changelog](https://github.com/microsoft/fluentui/blob/master/azure-pipelines.release.yml)
- [Commits](https://github.com/microsoft/fluentui/compare/@fluentui/react_v8.112.5...@fluentui/react_v8.121.11)

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

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

Author: dependabot[bot]

app/frontend/package-lock.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@azure/msal-browser": "^3.26.1",
     "@azure/msal-react": "^2.2.0",
-    "@fluentui/react": "^8.112.5",
+    "@fluentui/react": "^8.121.11",
     "@fluentui/react-components": "^9.56.2",
     "@fluentui/react-icons": "^2.0.265",
     "@react-spring/web": "^9.7.3",