fix(deps): update nextjs monorepo to v15

Author: renovate[bot]

examples/nextjs-app/package-lock.json

@@ -16,8 +16,8 @@
     "@types/react": "18.3.12",
     "@types/react-dom": "18.3.1",
     "eslint": "8.57.1",
-    "eslint-config-next": "14.2.18",
-    "next": "14.2.18",
+    "eslint-config-next": "15.0.3",
+    "next": "15.0.3",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "typescript": "5.6.3"