ci: switch to macOS-latest from deprecated macOS-11

Author: ErikBjare

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-11]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
         python_version: [3.9]
 
     steps: