Failed to CreateArtifact: Received non-retryable error: Failed request: (409) Conflict: an artifact with this name already exists on the workflow run

Bumping MACOSX_DEPLOYMENT_TARGET (10.14) to the minimum required (11.0).

While cibuildwheel can build CPython 3.8 universal2/arm64 wheels, we cannot test the arm64 part of them, even when running on an Apple Silicon machine. This is because we use the x86_64 installer of CPython 3.8. See the discussion in https://github.com/pypa/cibuildwheel/pull/1169 for the details. To silence this warning, set `CIBW_TEST_SKIP: "cp38-macosx_*:arm64"`.

Bumping MACOSX_DEPLOYMENT_TARGET (10.14) to the minimum required (11.0).

Bumping MACOSX_DEPLOYMENT_TARGET (10.14) to the minimum required (11.0).

Bumping MACOSX_DEPLOYMENT_TARGET (10.14) to the minimum required (11.0).