Run serially

Author: jmschonfeld

.github/workflows/pull_request.yml

@@ -17,6 +17,7 @@ jobs:
       enable_macos_checks: false
       macos_xcode_versions: '["16.3"]'
       macos_versions: '["sequoia"]'
+      windows_build_command: 'swift test --no-parallel'
 
   cmake_build:
     name: Build (CMake)