Skip Xcode 16.0 and 16.1 in PR workflow (#795)

Author: natecook1000

.github/workflows/pull_request.yml

@@ -26,6 +26,7 @@ jobs:
     with:
       windows_exclude_swift_versions: "[{\"swift_version\": \"5.9\"}]"
       enable_macos_checks: true
+      macos_exclude_xcode_versions: "[{\"xcode_version\": \"16.0\"}, {\"xcode_version\": \"16.1\"}]"
 
   cmake-build:
     name: CMake Build