Build universal2 wheels for macos

[devinrsmith]

This ensures that python 3.8+ produce universal2 wheels (python 3.6, 3.7 doesn't support M1).

Fixes #110

[devinrsmith]

Here are the resulting macos wheels:

jpy-0.16.0.dev0-cp36-cp36m-macosx_10_14_x86_64.whl
jpy-0.16.0.dev0-cp37-cp37m-macosx_11_0_x86_64.whl
jpy-0.16.0.dev0-cp38-cp38-macosx_11_0_universal2.whl
jpy-0.16.0.dev0-cp39-cp39-macosx_11_0_universal2.whl
jpy-0.16.0.dev0-cp310-cp310-macosx_11_0_universal2.whl
jpy-0.16.0.dev0-cp311-cp311-macosx_10_9_universal2.whl
jpy-0.16.0.dev0-cp312-cp312-macosx_10_9_universal2.whl

I've done basic smoketest that all of the universal2 wheels work on an M1.

[jmao-denver]

LGTM