Set weights_only to false for pytorch convert

[mkruszyx]

Fix for failing cpp_gapi-demos workflow with PyTorch 2.6

Cannot use weights_only=True with files saved in the legacy .tar format. In PyTorch 2.6, we changed the default value of the weights_only argument in torch.load from False to True. Re-running torch.load with weights_only set to False will likely succeed, but it can result in arbitrary code execution. Do it only if you got the file from a trusted source.

FAILED:
resnet-18-pytorch
regnetx-3.2gf
resnet-50-pytorch
resnet-34-pytorch

[Wovchena]

Jenkins ok to test