Fix macos 3.8 wheel skip

Wheel is still build, even though it can't be tested. Looks like wheel
indication we used in cibuildwheel doesn't match the real wheel.

Original intent was not to build such wheels.

.github/workflows/wheels.yaml

@@ -68,7 +68,7 @@ jobs:
           # musllinux arch skip: unlikely someone wants to run dlisio on alpine on non-standard architecture
           # musllinux cp38 skip: latest available numpy doesn't provide musslinux wheels, so it is unlikely useful
           # macosx 38 skip: cibuildwheel can't test it
-          CIBW_SKIP: pp* *-musllinux_i686 *-musllinux_aarch64 cp38*-musllinux* cp38*-macosx_*:arm64 cp36-* cp37-*
+          CIBW_SKIP: pp* *-musllinux_i686 *-musllinux_aarch64 cp38*-musllinux* cp38*-macosx_*arm64 cp36-* cp37-*
 
         run: |
             python -m cibuildwheel --output-dir wheelhouse python/