chore: add vitest dependency

Author: pi0

package.json

@@ -44,6 +44,7 @@
   },
   "devDependencies": {
     "@types/node": "^20.11.6",
+    "@vitest/coverage-v8": "^1.2.2",
     "changelogen": "^0.5.5",
     "eslint": "^8.56.0",
     "eslint-config-unjs": "^0.2.1",