`Pix2StructImageProcessor` requires `torch>=1.11.0`
# What does this PR do?

So let's be nice to past CI ❤️ !


It's the argument `antialias` in `interpolate` only supported in `torch>=1.11.0`:
```
torch.nn.functional.interpolate(..., antialias=True)
```
_The documentation is not available anymore as the PR was closed or merged._