Select runners more carefully

Author: NathanDunfield

.github/workflows/macos.yml

@@ -9,19 +9,22 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-11, macos-13, macos-14]
+        os: [macos-12, macos-13-arm64]
 
     steps:
       - uses: actions/checkout@v4
 
+      - name: Processor type
+        run: sysctl -n machdep.cpu.brand_string
+
       - uses: actions/setup-python@v4
         name: Install Python
         with:
-          python-version: '3.9'
+          python-version: '3.11'
 
       - name: Install cibuildwheel
         run: |
-          python -m pip install "cibuildwheel==2.12.3"
+          python -m pip install "cibuildwheel==2.19.2"
 
       - name: Build wheels
         run: |