Upgrade Vite to v6 and Vitest to v3

This resolves security warnings related to esbuild, and brings the
project to latest.

Author: sjdemartini

example/package.json

@@ -60,8 +60,8 @@
   "devDependencies": {
     "@types/react": "^18.0.28",
     "@types/react-dom": "^18.0.11",
-    "@vitejs/plugin-react-swc": "^3.7.2",
+    "@vitejs/plugin-react-swc": "^3.8.0",
     "typescript": "^5.1.3",
-    "vite": "^5.4.14"
+    "vite": "^6.2.0"
   }
 }