Bump macos deploy to 11

indra/cmake/Variables.cmake

@@ -145,7 +145,7 @@ if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     message( FATAL_ERROR "Xcode 12.0.0 or greater is required." )
   endif ()
   message( STATUS "Building with " ${CMAKE_OSX_SYSROOT} )
-  set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15)
+  set(CMAKE_OSX_DEPLOYMENT_TARGET 11.0)
 
   set(CMAKE_XCODE_ATTRIBUTE_GCC_GENERATE_DEBUGGING_SYMBOLS YES)
   set(CMAKE_XCODE_ATTRIBUTE_DEBUG_INFORMATION_FORMAT dwarf-with-dsym)