Build(deps-dev): update @vitest/coverage-v8 requirement in /server

Updates the requirements on [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) to permit the latest version.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.2/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.1.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

server/package.json

@@ -71,7 +71,7 @@
     "@types/express": "^5.0.6",
     "@types/js-yaml": "^4.0.9",
     "@types/node": "^25.5.0",
-    "@vitest/coverage-v8": "^4.1.0",
+    "@vitest/coverage-v8": "^4.1.2",
     "esbuild": "^0.27.4",
     "eslint": "^10.1.0",
     "eslint-config-prettier": "^10.1.8",