CI: Make macOS build universal and bump GitHub actions versions

[shinra-electric]

Add the -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" flag, so CMake will create a universal binary.

If x86 support is dropped in the future, this flag can be removed.

Edit:
Also removed the artifact zipping step for macOS and Linux.
The upload-artifact action zips them as well by default, so they were being double-zipped.

[shinra-electric]

I got an email with a comment, but it seems to have disappeared or has been deleted.

Just to confirm, setting the CMake flag does indeed build a universal binary. Running the file command on the executable will give this output:

extract-xiso: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64] [arm64:Mach-O 64-bit executable arm64]
extract-xiso (for architecture x86_64):	Mach-O 64-bit executable x86_64
extract-xiso (for architecture arm64):	Mach-O 64-bit executable arm64

The compiled executable is available on the action build on my fork for reference:
https://github.com/shinra-electric/extract-xiso/actions