Bump github.com/emicklei/go-restful in /test/src

Bumps [github.com/emicklei/go-restful](https://github.com/emicklei/go-restful) from 2.9.5+incompatible to 2.16.0+incompatible.
- [Release notes](https://github.com/emicklei/go-restful/releases)
- [Changelog](https://github.com/emicklei/go-restful/blob/v3/CHANGES.md)
- [Commits](emicklei/go-restful@v2.9.5...v2.16.0)

---
updated-dependencies:
- dependency-name: github.com/emicklei/go-restful
  dependency-type: indirect
...

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