Bump start-server-and-test from 2.0.10 to 2.0.12 in /clients/js-legacy (#20)

Bumps [start-server-and-test](https://github.com/bahmutov/start-server-and-test) from 2.0.10 to 2.0.12.
- [Release notes](https://github.com/bahmutov/start-server-and-test/releases)
- [Commits](bahmutov/start-server-and-test@v2.0.10...v2.0.12)

---
updated-dependencies:
- dependency-name: start-server-and-test
  dependency-version: 2.0.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

clients/js-legacy/package.json

@@ -59,7 +59,7 @@
         "mocha": "^11.0.1",
         "prettier": "^3.4.2",
         "shx": "^0.3.4",
-        "start-server-and-test": "^2.0.8",
+        "start-server-and-test": "^2.0.12",
         "ts-node": "^10.9.2",
         "typescript": "^5.7.2",
         "typescript-eslint": "^8.22.0"