chore(deps)(deps-dev): bump @vitest/coverage-v8 from 2.1.9 to 4.0.18

Bumps [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) from 2.1.9 to 4.0.18.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.18/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.0.18
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/spec/package.json

@@ -78,7 +78,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@types/node": "^20.10.0",
-    "@vitest/coverage-v8": "^2.1.8",
+    "@vitest/coverage-v8": "^4.0.18",
     "tsx": "^4.21.0",
     "typescript": "^5.3.0",
     "vitest": "^2.1.8",