Add manylinux2014_aarch64 wheel support

[matthewfeickert]

@HDembinski @henryiii Would it be feasible to have boost-histogram add manylinux2014_aarch64 wheel support? At the moment, all tests of wheel builds for other packages that use boost-histogram in their tests (like https://github.com/scikit-hep/fastjet/) have to build a wheel from the sdist, which takes a bit of time when you're running under emulation in CI.