Pre-built binaries for PyTorch 1.11 on Linux

## 🚀 Feature
As far as I understood, at the moment Detectron2 cannot be installed along with PyTorch 1.11 without building from source.

## Motivation & Examples
It would be convenient to have prebuilt binaries for PyTorch 1.11 as PyTorch 1.10 is the most recent version implementing such feature https://detectron2.readthedocs.io/en/latest/tutorials/install.html#install-pre-built-detectron2-linux-only

This could avoid errors when building from source if the version of CUDA on the local machine does not exactly match the one of the PyTorch binaries as happened in https://github.com/facebookresearch/detectron2/issues/4343