Update macosx SDK

this one goes to eleven

Author: designatednerd

.circleci/config.yml

@@ -18,7 +18,7 @@ parameters:
     default: "11.0"
   macos_sdk: # The full SDK string to use for macOS builds
     type: string
-    default: "macosx10.16"
+    default: "macosx11.0"
   tvos_version: # The user-facing version string of tvOS builds
     type: string
     default: "14.0"