chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -107,7 +107,7 @@
     "@types/jsdom": "^21.1.1",
     "@types/node": "^22.10.3",
     "@types/serve-handler": "^6.1.4",
-    "@vitest/coverage-v8": "^2.1.5",
+    "@vitest/coverage-v8": "^4.0.0",
     "api-docs-gen": "^0.4.0",
     "bumpp": "^10.0.0",
     "cross-env": "^7.0.3",
@@ -155,7 +155,7 @@
     "typescript-eslint": "^8.46.2",
     "vitepress": "1.6.4",
     "vitepress-plugin-llms": "^1.1.0",
-    "vitest": "^2.1.5",
+    "vitest": "^4.0.0",
     "vue": "3.5.22",
     "vue-i18n": "workspace:*"
   },