chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
     "@icon-park/vue-next": "1.4",
     "@tailwindcss/postcss": "4.1",
     "@tailwindcss/typography": "0.5",
-    "@vitest/coverage-v8": "3.2",
+    "@vitest/coverage-v8": "4.0",
     "dependency-cruiser": "latest",
     "eslint": "*",
     "eslint-plugin-shuunen": "1.3",
@@ -24,7 +24,7 @@
     "unplugin-vue-components": "30.0",
     "vite": "*",
     "vitepress": "1.6",
-    "vitest": "3.2",
+    "vitest": "4.0",
     "vue": "*"
   },
   "files": [