chore(deps): update vitest monorepo to v4

Author: renovate[bot]

package.json

@@ -73,8 +73,8 @@
     "@types/react-dom": "^18.3.7",
     "@u3u/eslint-config": "^2.15.2",
     "@u3u/prettier-config": "^4.5.1",
-    "@vitest/coverage-v8": "^1.6.1",
-    "@vitest/ui": "^1.6.1",
+    "@vitest/coverage-v8": "^4.0.7",
+    "@vitest/ui": "^4.0.7",
     "bumpp": "^9.11.1",
     "dedent": "^1.6.0",
     "eslint": "^8.57.1",
@@ -87,7 +87,7 @@
     "string-format-jsx": "link:",
     "tsup": "^8.5.0",
     "typescript": "^5.9.2",
-    "vitest": "^1.6.1"
+    "vitest": "^4.0.7"
   },
   "peerDependencies": {
     "react": ">=16.8.0",