Updated adapter_config.json with required changes

adapter_config.json

@@ -1,7 +1,7 @@
 {
   "alpha_pattern": {},
   "auto_mapping": null,
-  "base_model_name_or_path": null,
+  "base_model_name_or_path": "gpt2",
   "bias": "none",
   "eva_config": null,
   "exclude_modules": null,
@@ -28,4 +28,4 @@
   "task_type": "CAUSAL_LM",
   "use_dora": false,
   "use_rslora": false
-}
+}