maint: update macos image for building wheels

Author: oscarbenjamin

.github/workflows/buildwheel.yml

@@ -9,8 +9,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # os: [ubuntu-20.04, windows-2019, macOS-10.15]
-        os: [ubuntu-20.04, macOS-10.15]
+        # os: [ubuntu-20.04, windows-2019, macos-12]
+        os: [ubuntu-20.04, macos-12]
 
     steps:
       - uses: actions/checkout@v3
@@ -45,7 +45,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macOS-10.15]
+        os: [ubuntu-20.04, macos-12]
         python-version: ['3.9', '3.10', '3.11']
 
     steps: