Apparently SETUPTOOLS_USE_DISTUTILS="stdlib" is one answer to 3.8/3.9 compatiibiity

See
pypa/setuptools#3532

Author: HinTak

.github/workflows/ci.yml

@@ -122,6 +122,7 @@ jobs:
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.21.3
         env:
+          SETUPTOOLS_USE_DISTUTILS: "stdlib"
           CIBW_BUILD: "${{ matrix.cp }}-*"
           CIBW_SKIP: "*musllinux*"
           CIBW_ARCHS: ${{ matrix.arch }}