fix pathos dependencies

Author: bnpaws

huggingface/pytorch/training/docker/2.6/py3/cu126/Dockerfile.gpu

@@ -49,7 +49,8 @@ RUN pip install --no-cache-dir \
     peft==${PEFT_VERSION} \
     flash-attn==${FLASH_ATTN_VERSION} \
     dill==0.3.8 \
-    multiprocess==0.70.16
+    multiprocess==0.70.16 \
+    pathos==0.3.3
 
 # hf_transfer will be a built-in feature, remove the env variable then
 ENV HF_HUB_ENABLE_HF_TRANSFER="1"