chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "@types/node": "^24.10.0",
     "@types/semver": "^7.7.1",
     "@unhead/vue": "^2.0.19",
-    "@vitest/coverage-v8": "^3.2.4",
+    "@vitest/coverage-v8": "^4.0.6",
     "@vue/test-utils": "^2.4.6",
     "changelogen": "^0.6.2",
     "eslint": "9.38.0",
@@ -83,7 +83,7 @@
     "tinyglobby": "^0.2.15",
     "typescript": "5.9.3",
     "unbuild": "^3.6.1",
-    "vitest": "^3.2.4",
+    "vitest": "^4.0.6",
     "vitest-environment-nuxt": "^1.0.1",
     "vue": "3.5.22",
     "vue-tsc": "^3.1.2"