fix: Address PyTorch Model Loading Deprecation Warning (GH-30)

[mbsantiago]

This PR addresses the PyTorch deprecation warning related to loading models without explicitly setting the only_weights parameter (#30). This warning stems from a security concern with using the pickle library for loading model objects, as it can potentially execute arbitrary code.

While this is unlikely to be an issue with the model shipped with this package, it could pose a risk when loading custom models or if unexpected behavior arises in future versions.

To mitigate this:

• Set only_weights=True as the default when loading the model. This loads only the model weights and avoids potential security risks associated with unpickling.
• Added a test to verify that loading the model with only_weights=True does not affect its behavior. This test compares the loaded parameters and predictions between the two loading methods across various audio inputs.

Our tests confirm that using only_weights=True does not alter the model's functionality, allowing us to safely address the deprecation warning and enhance security.

Thanks to @revilodarnoc for filing the issue!