Bump xcode to 12.4.0

bcardiff · bcardiff · commit 818f2616418a · 2021-06-16T14:44:04.000-03:00
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 jobs:
   omnibus_osx_llvm:
     macos:
-      xcode: "11.1.0"
+      xcode: 12.4.0
     environment:
       LLVM_VERSION: 10.0.0
       MACOSX_DEPLOYMENT_TARGET: 10.11
