Fix win platform tag (#907)

Author: stuqdog

.github/workflows/build-wheels.yml

@@ -44,7 +44,7 @@ jobs:
           - arch: linux_armv6l
             ext: so
             whl: linux_armv7l
-          - arch: windows_x86_64
+          - arch: win_amd64
             ext: dll
             whl: windows_x86_64
     steps: