Support PyTorch 2.9

[akihironitta]

🚀 The feature, motivation and pitch

PyTorch 2.9 was released last week.

ref:

• https://download.pytorch.org/whl/torch
• https://pytorch.org/blog/pytorch-2-9/

Alternatives

No response

Additional context

No response

[jesseangelis]

TorchScript is deprecated in PyTorch 2.9. Should PyG move from torch.jit.script to something like torch.export or torch.compile?