Use Apple Silicon in CI

Author: JamesWrigley

.github/workflows/CI.yml

@@ -23,7 +23,7 @@ jobs:
           - { os: ubuntu-latest, version: 'nightly', arch: x64}
           - { os: ubuntu-latest, version: '1', arch: x86 }
           - { os: windows-latest, version: '1', arch: x64}
-          - { os: macOS-latest, version: '1', arch: x64}
+          - { os: macOS-latest, version: '1', arch: aarch64}
 
     steps:
       - uses: actions/checkout@v4