Update xcode-macOS.yml to macos-13 runner (#2343)

The previous macos-11 has been removed

Author: andrewfb

.github/workflows/xcode-macOS.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: macos-11
+    runs-on: macos-13
     strategy:
       matrix:
         config: [Debug, Release]