weights_only default flip for torch.load

[mikaylagawarecki]

🐛 Describe the bug

We've flipped the default for the weights_only argument in torch.load to True in pytorch/pytorch, see here for details + documentation and this is coming in torch 2.6.

This is expected to be quite a BC-breaking change, especially if any torch.load calls are not loading plain tensors.

We should make sure that all the torch.load calls in torchserve are still working (see this PR #3073)

This should be merged before updating PyTorch version.

cc @agunapal @mreso