chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -77,7 +77,7 @@
     "@rollup/plugin-alias": "5.1.1",
     "@rollup/plugin-replace": "6.0.2",
     "@types/node": "24.8.1",
-    "@vitest/coverage-istanbul": "3.2.4",
+    "@vitest/coverage-istanbul": "4.0.3",
     "eslint": "9.38.0",
     "eslint-config-mister-hope": "0.9.6",
     "husky": "9.1.7",
@@ -88,7 +88,7 @@
     "rollup-plugin-dts": "6.2.3",
     "rollup-plugin-esbuild": "6.2.1",
     "typescript": "5.9.3",
-    "vitest": "3.2.4"
+    "vitest": "4.0.3"
   },
   "packageManager": "pnpm@10.18.3",
   "engines": {