Fix: Explicitly set weights_only=True in torch.load to handle FutureWarning (#949)

[NripeshN]

Description

This PR addresses closes #949 by modifying the default_deserialize_torch_model function in PyTorchShim. The change explicitly sets the weights_only=True flag when calling torch.load. This resolves the FutureWarning regarding potential security issues with implicit pickle module usage and aligns with future PyTorch updates where weights_only will default to True.

Types of change

Bug Fix

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.