chore(deps): bump next from 16.1.7 to 16.2.6 in /templates/next-app

Bumps [next](https://github.com/vercel/next.js) from 16.1.7 to 16.2.6.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v16.1.7...v16.2.6)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.2.6
  dependency-type: direct:production
...

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

templates/next-app/package.json

@@ -12,7 +12,7 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "next": "16.1.7",
+    "next": "16.2.6",
     "next-themes": "^0.4.6",
     "react": "^19.2.4",
     "react-dom": "^19.2.4"