Update Windows-arm.yml

Author: mcbarton

.github/workflows/Windows-arm.yml

@@ -241,7 +241,7 @@ jobs:
             cppyy: Off
           - name: win11-msvc-clang18-cling
             os: windows-11-arm
-            compiler: windows-11-arm
+            compiler: msvc
             clang-runtime: '18'
             cling: On
             cling-version: '1.2'