Fixing MacOS CI Runners

[JamesMc86]

There are a couple of issues with the latest MacOS runners in CI:

• Miniconda is no longer shipped.
• They are now Arm64 runners.

I have a branch on my own repo: https://github.com/WiresmithTech/hdf5-rust/actions/runs/9208054386/job/25329454964?pr=5 which fixes these issues however it seems that 1.8 and 1.10 have not been packaged for Arm64.

Do we just drop these versions in CI? Or do we alter CI to include Arm and x86 MacOS versions? If you are happy to drop them I can have a PR to you very quickly!

[mulimoen]

Could we alter CI to use an older macos runner for 1.8 and 1.10? 1.8 is still the only available hdf5 on some HPCs

[JamesMc86]

No worries, let me take a look - that shouldn't be too bad

[mulimoen]

Would you like to remove the brew 1.8 job in a PR?