Add aarch64 again

[jeevithakannan2]

Type of Change

• I don't really know what type of change is this. I just added the aarch64 in CI and it works.

Description

• Added aarch64 in workflow

Testing

• Tested on linutil fork and runs without errors.

Issues / other PRs related

• Resolves #450
• Resolves #252

Additional Information

• I took a look at the old the errors of aarch64 build. I encounter similar errors when switching from my arch system to ubuntu20 testing system sometimes. Doing a cargo clean and re-building would resolve the errors. I am not sure whether these two issues are related. For now aarch64 has no errors. In case we encounter such errors in future we can fix them.
• The error happens when half of the cargo.lock gets build on newer glibc and the other half gets build on older glibc.
• cargo clean would clear all the old built crate binaries and will build again from the start so there would no conflicts.

Checklist

• [x] My code adheres to the coding and style guidelines of the project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] My changes generate no errors/warnings/merge conflicts.