ci: test native installation on arm64-darwin

See related flavorjones/ruby-c-extensions-explained#30

Author: flavorjones

.github/workflows/ci.yml

@@ -306,14 +306,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos]
         ruby: ["3.3", "3.2", "3.1", "3.0"]
         include:
-          - os: macos
+          - os: macos-13
             platform: x86_64-darwin
-          # # arm64-darwin installation testing is omitted until github actions supports it
-          # - os: macos
-          #   platform: arm64-darwin
+          - os: macos-14
+            platform: arm64-darwin
           - os: windows
             ruby: "3.0"
             platform: x64-mingw32