Filter out cibuildwheel warning for testing MacOS wheels on 3.8

See pypa/cibuildwheel#1169

Author: skirpichev

.github/workflows/build_wheels.yml

@@ -20,6 +20,7 @@ jobs:
           CIBW_SKIP: pp*
           CIBW_BEFORE_BUILD: bash scripts/cibw_before_all.sh
           CIBW_TEST_EXTRAS: tests
+          CIBW_TEST_SKIP: cp38-macosx_arm64
           CIBW_TEST_COMMAND: >
             pytest {package}/test/ &&
             python {package}/test_cython/runtests.py