break: drop Python 3.8 (#2686)

test/test_testing.py

@@ -167,11 +167,6 @@ def test_failing_test(tmp_path: Path) -> None:
             add_env={
                 "CIBW_TEST_REQUIRES": "pytest",
                 "CIBW_TEST_COMMAND": f"{utils.invoke_pytest()} {{project}}/test",
-                # CPython 3.8 when running on macOS arm64 is unusual. The build
-                # always runs in x86_64, so the arm64 tests are not run. See
-                # #1169 for reasons why. That means the build succeeds, which
-                # we don't want. So we skip that build.
-                "CIBW_SKIP": "cp38-macosx_arm64",
             },
         )
 
@@ -199,9 +194,6 @@ def test_bare_pytest_invocation(
                 "CIBW_TEST_COMMAND": (
                     "python -m pytest" if test_runner == "pytest" else "python -m unittest"
                 ),
-                # Skip CPython 3.8 on macOS arm64, see comment above in
-                # 'test_failing_test'
-                "CIBW_SKIP": "cp38-macosx_arm64",
             },
         )