updated Dockerfile based on NGC PyG 24.09 image

[sbhavani]

Updated to use new NGC CUDA DL base image. Some differences:

1. /workspace is the working directory
2. Python libs removed that were not included in NGC PyG image:
   torch_scatter torch_sparse torch_cluster torch_spline_conv torchnet==0.0.4 h5py torchnet
3. Using latest stable versions for graphviz and torch

[puririshi98]

will merge once @sbhavani has tests passing locally