Update 2 files

- /build.txt
- /nnunet_for_pytorch.def

build.txt

-apptainer build containers/nvidia_pytorch:21.11-py3.sif  docker://nvcr.io/nvidia/pytorch:21.11-py3
+apptainer build containers/nvidia_pytorch_21.11-py3.sif  docker://nvcr.io/nvidia/pytorch:21.11-py3
 
 
 MODULE_NAME=nnunet_for_pytorch

nnunet_for_pytorch.def

 Bootstrap: localimage
-From: /proj/nsc_testing/xuan/containers/nvidia_pytorch:21.11-py3.sif
+From: /proj/nsc_testing/xuan/containers/nvidia_pytorch_21.11-py3.sif
 
 
 %environment