chore(deps): update test packages to v4

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "@nuxt/kit": "4.1.2",
     "@types/estree": "1.0.8",
     "@types/node": "22.18.10",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.4",
     "acorn": "8.15.0",
     "bumpp": "10.3.1",
     "eslint": "9.38.0",
@@ -75,7 +75,7 @@
     "typescript": "5.9.3",
     "unbuild": "3.6.1",
     "vite": "7.1.12",
-    "vitest": "3.2.4"
+    "vitest": "4.0.4"
   },
   "resolutions": {
     "magic-regexp": "link:.",