fix: hfdeepspeed config argument (#15711)

`HfDeepSpeedConfig` accepts a dictionary or path to `.json` file containing DS configurations, not `TrainingArguments`.

src/transformers/trainer.py

@@ -971,7 +971,7 @@ class Trainer:
             # Rebuild the deepspeed config to reflect the updated training parameters
             from transformers.deepspeed import HfDeepSpeedConfig
 
-            self.args.hf_deepspeed_config = HfDeepSpeedConfig(self.args)
+            self.args.hf_deepspeed_config = HfDeepSpeedConfig(self.args.deepspeed)
 
     def _report_to_hp_search(
         self, trial: Union["optuna.Trial", Dict[str, Any]], epoch: int, metrics: Dict[str, float]