Update submissions.json

Here is the evaluation command I used (not HF jobs, as I do not have a pro account):
```
uv run lighteval vllm "model_name=lukmanaj/smollm3-sft-colab-merged,dtype=float16" "lighteval|gsm8k|0|0" --push-to-hub --results-org lukmanaj
```

submissions.json

@@ -55,6 +55,14 @@
             "chapter": "1",
             "submission_date": "2025-09-13",
             "results-dataset": "iamgroot42/details_iamgroot42__smollm3-Custom-SFT"
+        },
+        {
+            "username": "lukmanaj",
+            "model_name": "lukmanaj/smollm3-sft-colab-merged",
+            "chapter": "1",
+            "submission_date": "2025-10-06",
+            "results-dataset": "lukmanaj/details_lukmanaj__smollm3-sft-colab-merged_private"
         }
+      
     ]
 }