build(deps): bump next from 16.3.6 to 16.3.8 in /web

Bumps [next](https://github.com/vercel/next.js) from 16.3.6 to 16.3.8.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](vercel/next.js@v16.3.6...v16.3.8)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.3.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

web/package.json

@@ -26,7 +26,7 @@
     "@playwright/test": "1.55.1",
     "@submitqueue/api": "workspace:*",
     "@types/node": "22.18.6",
-    "next": "16.3.6",
+    "next": "16.3.8",
     "pino": "10.4.0",
     "react": "19.3.0",
     "react-dom": "19.3.0",