Fix bench_auto_batching.py
Fix bench_auto_batching.py

MIN_IDEAL_BATCH_DURATION and MAX_IDEAL_BATCH_DURATION now live in
_parallel_backends.AutoBatchingMixin rather than in parallel.

aabadie/joblib,karandesai-96/joblib,joblib/joblib,aabadie/joblib,lesteve/joblib,tomMoral/joblib,lesteve/joblib,karandesai-96/joblib,tomMoral/joblib,joblib/joblib