Fix TorchModuleWrapper serialization issue

[Surya2k1]

Currently model with TorchModuleWrapper fails to save with the following error.

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 64: invalid start byte

I have tried with different encoding as experimental and found 'latin-1' works fine for saving and reloading along with some code changes to TorchModuleWrapper class. Atleast this change worked for the minimal code snippet as mentioned in #20860

May fixes #20860