Test with MacOS 12 and 14

Author: sebthom

.github/workflows/build.yml

@@ -31,9 +31,9 @@ jobs:
           experimental: false
         - os: ubuntu-20.04
           experimental: false
-        #- os: macos-12.0  # not enough runners available
-        #  experimental: false
-        - os: macos-11.0
+        - os: macos-14 # ARM
+          experimental: false
+        - os: macos-12 # x86
           experimental: true
 
     steps: