use 'auto' for mac wheel builds

Author: whitews

.github/workflows/wheels.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Build wheels
         env:
           CIBW_SKIP: pp* *-musllinux_* *-manylinux_i686 *-win32  # skip PyPy, musllinux, 32-bit Linux & win32 builds
-          CIBW_ARCHS_MACOS: x86_64 arm64
+          CIBW_ARCHS_MACOS: auto
           CIBW_BUILD: cp39-* cp310-* cp311-* cp312-* cp313-*
         run: python -m cibuildwheel --output-dir wheelhouse