Update _base.py - Remote (.bin) model load fix

[Shades-en]

Whats happening -
.bin Model is unable to load - FIleNotFound error.

When you load a model from huggingface remotely with use_safetensors = False, there are two extensions to work with - .bin, .pt.
Line 834, checks the cached model directory for the model base name with the above extensions in the same order as above.

Case - 1: If no model found with either extensions, the original code works as expected (throws error).
Case - 2: If models with both extensions found or if only .pt extension is found, the model with .pt extension loads. Although in the former case, the user has no liberty to choose between the two models.
Case - 3: If only .bin model exists. then it throws a FileNotFoundError as in the first case.

The fix -
A simple fix with temp variable, which hold the latest found model in order to prevent the resolved_archive_file variable defaulting to None incase the model with next search extension is not found.

[fxmarty]

LGTM thank you for the fix!