ci: fix download collision issue with cibuildwheen

The cibuildwheel for macos for both arm64 and x86_64 create wheel
artifacts named the same (e.g. pybwa-1.0.3-cp311-cp311-macosx_14_0_arm64.whl).
The upload/artifact step then uses the correct name when it uploads, but
it zips it up first, so when you unzip the macos artifacts for the two
architecture, they'll have the same name.

See: https://cibuildwheel.pypa.io/en/stable/faq/#macos-building-cpython-38-wheels-on-arm64
See: pypa/cibuildwheel#2080

.github/workflows/wheels.yml

@@ -40,9 +40,14 @@ jobs:
         with:
           submodules: "true"
 
+      - uses: actions/setup-python@v5
+        if: runner.os != 'macOS' || runner.arch != 'ARM64'
+
+      # See: https://cibuildwheel.pypa.io/en/stable/faq/#macos-building-cpython-38-wheels-on-arm64
       - uses: actions/setup-python@v5
         with:
           python-version: 3.8
+        if: runner.os == 'macOS' && runner.arch == 'ARM64'
 
       - name: Install cibuildwheel
         run: python -m pip install cibuildwheel==2.15.0