chore: Bump @mockoon/cli from 8.4.0 to 9.1.0 in /frontend

Bumps [@mockoon/cli](https://github.com/mockoon/mockoon) from 8.4.0 to 9.1.0.
- [Release notes](https://github.com/mockoon/mockoon/releases)
- [Commits](mockoon/mockoon@v8.4.0...v9.1.0)

---
updated-dependencies:
- dependency-name: "@mockoon/cli"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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