Fix eval_logger import for mmlu/_generate_configs.py (#1593)

* Fix eval_logger import for mmlu/_generate_configs.py

* linter

---------
Co-authored-by: Hailey Schoelkopf <65563625+haileyschoelkopf@users.noreply.github.com>

lm_eval/tasks/mmlu/_generate_configs.py

@@ -2,12 +2,14 @@
 Take in a YAML, and output all "other" splits with this YAML
 """
 import argparse
+import logging
 import os
 
 import yaml
 from tqdm import tqdm
 
-from lm_eval.logger import eval_logger
+
+eval_logger = logging.getLogger("lm-eval")
 
 
 SUBJECTS = {