Update adapter_config.json

changed task type from null to "CAUSAL_LM"

adapter_config.json

@@ -31,7 +31,7 @@
     "gate_proj",
     "k_proj"
   ],
-  "task_type": null,
+  "task_type": "CAUSAL_LM",
   "use_dora": false,
   "use_rslora": false
 }