mgr/dashboard: bump start-server-and-test

Bumps [start-server-and-test](https://github.com/bahmutov/start-server-and-test) from 1.12.1 to 2.0.3.
- [Release notes](https://github.com/bahmutov/start-server-and-test/releases)
- [Commits](bahmutov/start-server-and-test@v1.12.1...v2.0.3)

---
updated-dependencies:
- dependency-name: start-server-and-test
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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