Support for aarch64-apple-darwin

[cgilmore]

• Elixir 1.17.2
• Phoenix 1.7.14
• lightning_css 0.5.0
• Apple M1 Pro, Ventura 13.7

First time trying out the library. When attempting to run the application, I'm getting the following error:

** (Mix) Could not start application lightning_css: exited in: LightningCSS.start(:normal, [])
    ** (EXIT) an exception was raised:
        ** (RuntimeError) lightning_css is not available for architecture: aarch64-apple-darwin22.6.0
            (lightning_css 0.5.0) lib/lightning_css/architectures.ex:90: LightningCSS.Architectures.unsupported_arch/0
            (lightning_css 0.5.0) lib/lightning_css/paths.ex:12: LightningCSS.Paths.bin/0
            (lightning_css 0.5.0) lib/lightning_css/versions.ex:17: LightningCSS.Versions.bin/0
            (lightning_css 0.5.0) lib/lightning_css.ex:18: LightningCSS.start/2
            (kernel 9.2.4) application_master.erl:293: :application_master.start_it_old/4

I wasn't sure if this should be raised here or in the LightningCSS repo. I thought of mentioning it here first because I can see in LightningCSS's GitHub workflow where they target a build for aarch64-apple-darwin.

One thing I notice is that what comes back from :erlang.system_info(:system_architecture) is "aarch64-apple-darwin22.6.0". However, from NodeJS's .arch(), .platform() and .release() comes back with "arm64 darwin 22.6.0", which lines up closer to what this repo references with regards to available targets that LightningCSS supports. So, this might be causing a discrepancy in discerning whether the library is available or not.

[joelpaulkoch]

I ran into the same issue. #29 provides a fix.