Add missing coverage dependency

Author: torifat

package.json

@@ -59,6 +59,7 @@
     "@changesets/write": "^0.1.9",
     "@eslint/eslintrc": "^3.3.1",
     "@eslint/js": "^9.27.0",
+    "@vitest/coverage-v8": "^3.1.4",
     "@vitest/ui": "3.1.4",
     "ajv": "^8.17.1",
     "esbuild": "^0.25.5",