Bump react-router in /demos/vite-react-router-web-wasm

Bumps [react-router](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router) from 7.5.2 to 7.12.0.
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/react-router@7.12.0/packages/react-router)

---
updated-dependencies:
- dependency-name: react-router
  dependency-version: 7.12.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demos/vite-react-router-web-wasm/package.json

@@ -16,7 +16,7 @@
     "isbot": "^5.1.17",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
-    "react-router": "^7.5.2"
+    "react-router": "^7.12.0"
   },
   "devDependencies": {
     "@react-router/dev": "^7.1.5",