chore(deps): bump next from 15.4.8 to 15.4.9

Bumps [next](https://github.com/vercel/next.js) from 15.4.8 to 15.4.9.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.8...v15.4.9)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -45,7 +45,7 @@
     "monaco-editor": "^0.52.2",
     "monaco-editor-webpack-plugin": "^7.1.0",
     "nanoid": "^5.1.5",
-    "next": "15.4.8",
+    "next": "15.4.9",
     "polkadot-api": "^1.10.0",
     "prettier": "^3.5.3",
     "react": "^19.1.0",