Chronos-2: set default dataloader_num_workers=0 in Trainer (#409)

*Issue #, if available:*

*Description of changes:* 0 is a better default than 1. 


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Author: abdulfatir

src/chronos/chronos2/pipeline.py

@@ -265,7 +265,7 @@ def fit(
             report_to="none",
             max_steps=num_steps,
             gradient_accumulation_steps=1,
-            dataloader_num_workers=1,
+            dataloader_num_workers=0,
             tf32=has_sm80 and not use_cpu,
             bf16=has_sm80 and not use_cpu,
             save_only_model=True,