[chore] Bump Next.js to v15.5.2 (#32)

Update the resolved version of Next.js to `15.5.2` for local development.
Also update `eslint-next` to match.

Author: DellaBitta

js-sdk-framework-tests/nextjs/package.json

@@ -23,7 +23,7 @@
     "@types/node": "20.10.4",
     "@types/react": "latest",
     "eslint": "^8",
-    "eslint-config-next": "14.2.13",
+    "eslint-config-next": "15.5.2",
     "typescript": "5.3.3"
   }
 }