Bump next from 16.3.4 to 16.4.0 in /tools/web

Bumps [next](https://github.com/vercel/next.js) from 16.3.4 to 16.4.0.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](vercel/next.js@v16.3.4...v16.4.0)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

tools/web/package-lock.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@material/web": "2.2.0",
     "esp-web-tools": "10.4.0",
-    "next": "16.3.4",
+    "next": "16.4.0",
     "react": "19.2.8",
     "react-dom": "19.2.8",
     "react-server-dom-webpack": "19.2.8",