update vilt model: remove index param in torch.meshgrid
# What does this PR do?

remove index argument in torch.meshgrid in ViLT model which would lead to 
`Exception has occurred: TypeError
meshgrid() got an unexpected keyword argument 'indexing'`





The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_16534). All of your documentation changes will be reflected on that endpoint.<|||||>Hi,

Thanks for your PR. However, reading the [documentation of torch.meshgrid](https://pytorch.org/docs/stable/generated/torch.meshgrid.html), the PyTorch team is planning to change the default behaviour in the future to indexing="xy" to match the behaviour of Numpy. So I don't think we can merge this PR.

Instead, we could add a warning, telling users to have PyTorch 1.10 installed or higher, similar to #16756.<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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