Fix wheel builds and uploads for musl ARM (#2518)
If you look at https://pypi.org/project/uv/0.1.22/#files...
- We didn't upload the ARMv6 wheel (I thought I had removed the `# Skip
for `arm`, which is not supported by PyPI.`), it must've gotten re-added
in a rebase or something.
- We lost the musllinux builds for ARM. I think this is because I built
them as manylinux.
