chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -21,7 +21,7 @@
     "@eslint/eslintrc": "3.3.1",
     "@eslint/js": "9.38.0",
     "@types/node": "20.19.23",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.1",
     "cpy": "12.1.0",
     "eslint": "9.38.0",
     "eslint-config-next": "15.5.6",
@@ -36,7 +36,7 @@
     "tempy": "3.1.0",
     "typescript": "5.9.3",
     "typescript-eslint": "8.46.2",
-    "vitest": "3.2.4"
+    "vitest": "4.0.1"
   },
   "packageManager": "pnpm@10.19.0"
 }