Provide prebuilt artifacts for ARM64 Linux

[rami3l]

Hello again! Rustup has recently migrated (rust-lang/rustup#4154) to ARM64 Linux runners to reflect our upstream (https://github.com/rust-lang/rustup).

In the process, we have noticed (rust-lang/rustup#4154 (comment)) that bindgen-cli doesn't have a prebuilt artifact for aarch64-unknown-linux-gnu yet.

Fortunately, our fallback mechanism of manually building the binary from source has been successfully triggered, so this has not caused too much of a trouble for us.

That said, with the ARM64 Linux runners becoming GA for public repos (https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview), I do imagine more workflows will benefit from precompiled artifacts for that platform.

Many thanks in advance 🙏