Add linux-aarch64 builds

[kilian-hu]

Checklist

• Used a personal fork of the feedstock to propose changes
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Adding a linux-aarch64 build for llama-cpp-python because it was missing and llama.cpp is already being built for linux-aarch64 so this should also make sense.

[kilian-hu]

@conda-forge-admin, please rerender

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.

[toniher]

It looks OK, but since @jjerphan recently made related edits in llama.cpp , I defer to his opinion

[jjerphan]

@conda-forge-admin, please rerender

[jjerphan]

Thank you, @kilian-hu.