build for macOS on macOS12

Author: rgaudin

.github/workflows/wheels.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-11]  # windows-2019
+        os: [ubuntu-20.04, macos-12]  # macos-11, windows-2019
 
     steps:
       - uses: actions/checkout@v3