chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -52,15 +52,15 @@
     "@refinist/eslint-config": "^1.0.4",
     "@refinist/prettier-config": "^0.0.4",
     "@vitejs/plugin-vue": "^6.0.1",
-    "@vitest/coverage-istanbul": "3.2.4",
+    "@vitest/coverage-istanbul": "4.0.15",
     "@vue/test-utils": "^2.4.6",
     "bumpp": "^10.2.3",
     "eslint": "^9.34.0",
     "jsdom": "^26.1.0",
     "prettier": "^3.6.2",
     "tsdown": "^0.14.2",
     "typescript": "^5.9.2",
-    "vitest": "^3.2.4",
+    "vitest": "^4.0.15",
     "vue": "^3.5.21"
   },
   "peerDependencies": {