Don't run cibuildwheel twice on Windows

Author: oscarbenjamin

.github/workflows/buildwheel.yml

@@ -65,10 +65,11 @@ jobs:
           CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows_arm64.sh
 
         # After all the Windows-specific steps above this is what actually
-        # #builds the wheels for every other OS:
+        # builds the wheels for every other OS:
 
       - name: Build wheels for any other OS
         uses: pypa/cibuildwheel@63fd63b352a9a8bdcc24791c9dbee952ee9a8abc # v3.3.0
+        if: ${{ !startsWith( matrix.os , 'windows' ) }}
 
       - uses: actions/upload-artifact@v5
         with: