Point prowlbench config to parquet (consistent builder across configs)

README.md

@@ -23,7 +23,7 @@ configs:
     data_files: corpus.parquet
     default: true
   - config_name: prowlbench
-    data_files: prowlbench.jsonl
+    data_files: prowlbench.parquet
 ---
 
 <p align="center"><img src="https://huggingface.co/datasets/Podric/prowl-secrets-corpus/resolve/main/logo.png" width="360" alt="Prowl"></p>