move race on HF to EleutherAI group

lm_eval/tasks/race/race.yaml

 group:
   - multiple_choice
 task: race
-dataset_path: bfattori/race
+dataset_path: EleutherAI/race
 dataset_name: high
 output_type: multiple_choice
 test_split: test
@@ -11,4 +11,4 @@ doc_to_target: !function preprocess_race.doc_to_target
 metric_list:
   - metric: acc
     aggregation: mean
-    higher_is_better: true
\ No newline at end of file
+    higher_is_better: true