Add support for macOS 13 machines

[dfed]

Resolves #500

[eregon]

ruby-head doesn't seem to work on macos-13:
https://github.com/ruby/setup-ruby/actions/runs/4789926905/jobs/8518817787?pr=501

  /Users/runner/.rubies/ruby-head/bin/ruby --version
  dyld[45546]: Library not loaded: /usr/local/opt/capstone/lib/libcapstone.4.dylib
    Referenced from: <104F7475-BC65-3E02-A136-C0E500266ADC> /Users/runner/.rubies/ruby-head/bin/ruby
    Reason: tried: '/usr/local/opt/capstone/lib/libcapstone.4.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/usr/local/opt/capstone/lib/libcapstone.4.dylib' (no such file), '/usr/local/opt/capstone/lib/libcapstone.4.dylib' (no such file), '/usr/local/lib/libcapstone.4.dylib' (no such file), '/usr/lib/libcapstone.4.dylib' (no such file, not in dyld cache)
  Took   0.04 seconds

[eregon]

I'll fix that separately, since it probably needs to be fixed in https://github.com/ruby/ruby-dev-builder anyway.

[eregon]

That's fixed by ruby/ruby@0bf10df and just waiting https://github.com/ruby/ruby-dev-builder/actions/runs/4790510092/jobs/8519733847