Offer more architectures in GitHub releases

[autarch]

Is your feature request related to a problem? Please describe.

I'd like to be able to use the GitHub release version of black on arm64 Linux hosts, but I can't.

Describe the solution you'd like

Produce an arm64 Linux GitHub release of black. Ideally, this would include changing the existing linux release to include the appropriate architecture in the release file name (presumably "x86-64").

Describe alternatives you've considered

There's not really an alternative here. I want to use the binary release because it's quick and easy to get running on a machine in CI. I don't have to worry about having Python installed, which version of Python is installed, etc.