chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -71,7 +71,7 @@
   "devDependencies": {
     "@biomejs/biome": "2.3.4",
     "@types/node": "22.19.0",
-    "@vitest/coverage-v8": "3.2.4",
+    "@vitest/coverage-v8": "4.0.8",
     "copyfiles": "2.4.1",
     "del-cli": "7.0.0",
     "esbuild": "0.25.12",
@@ -80,7 +80,7 @@
     "tsx": "4.20.6",
     "typescript": "5.9.3",
     "vite-tsconfig-paths": "5.1.4",
-    "vitest": "3.2.4",
+    "vitest": "4.0.8",
     "vitest-mock-extended": "3.1.0"
   },
   "pnpm": {