build(deps-dev): bump @testing-library/vue in /build/frontend-legacy

Bumps [@testing-library/vue](https://github.com/testing-library/vue-testing-library) from 5.9.0 to 8.1.0.
- [Release notes](https://github.com/testing-library/vue-testing-library/releases)
- [Commits](testing-library/vue-testing-library@v5.9.0...v8.1.0)

---
updated-dependencies:
- dependency-name: "@testing-library/vue"
  dependency-version: 8.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -112,7 +112,7 @@
     "@pinia/testing": "^0.1.7",
     "@testing-library/jest-dom": "^6.6.4",
     "@testing-library/user-event": "^14.6.1",
-    "@testing-library/vue": "^5.8.3",
+    "@testing-library/vue": "^8.1.0",
     "@types/dockerode": "^3.3.45",
     "@types/wait-on": "^5.3.4",
     "@vitejs/plugin-vue2": "^2.3.4",