This PR adds the current release version of mumax and tweaks the install
of the previous beta version.
- Set the url parameter to reflect the release version over the beta
version. Hopefully, this will be consistent going forward.
- Set an explicit url for the previous beta version.
- Accept values for `cuda_arch`. The previous version had its own list
but the release version does not.
- Replace the built in cuda compute capabilities list with the one
provided by Spack for the 3.10beta version.
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