Update macOS support?

[rfeinman]

Thank you very much for your efforts, I'm a big fan of pytorch3d!

I'm wondering if you might consider updating your macOS support. From install.md it seems that the only option for mac users is to install with pytorch 1.9.0, which is now over a year old (and 3 minor versions behind the latest stable). Therefore at the moment I have to decide between getting the latest pytorch features or having pytorch3d installed.