update ci arch

Author: nhz2

.github/workflows/CI.yml

@@ -26,7 +26,11 @@ jobs:
           - windows-latest
           - macos-latest
         arch:
-          - x64
+          - 'default'
+          - 'x86'
+        exclude:
+          - os: macos-latest
+            arch: x86
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2