Select Xcode 12.2

.github/workflows/macos.yml

@@ -7,7 +7,7 @@ on:
     branches: [ master ]
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_11.4.1.app/Contents/Developer
+  DEVELOPER_DIR: /Applications/Xcode_12.2.app/Contents/Developer
 
 jobs:
   build: