Add Python 3.11 wheels

[remia]

Following Python 3.11 release, this PR update the wheel generator to include it.

Other updates:

• Python 3.6 is EOL so I removed it,
• All 32 bits architecture variants removed,
• cibuildwheel updated to latest version for Python 3.11 support,
• Build arm64 wheels for Apple silicon instead of universal2 following discussion in Should arm64 runners build both universal2 and arm64 wheels by default? pypa/cibuildwheel#1204 and Numpy distribution model.

If there is concerns about some of the removal, I'm not strongly opposed to adding them back, also noting that there should now be a source distribution allowing pip to build the package on the unusual version / architecture.

[doug-walker]

The main item that stands out to me here is "Build arm64 wheels for Apple silicon instead of universal2". @remia, would it be useful for you to post on the OCIO Slack to check if anyone needs the universal2? Or is that something you're confident won't cause any issues?

[remia]

@doug-walker I will ask on slack good point, from what I understand, one of the only use case is if someone wants to distribute a Python application where the end user architecture is unknown. But given that well known projects, including Numpy don't ship universal2 wheel, I think this is relatively safe choice.

[JeanChristopheMorinPerso]

@remia https://cibuildwheel.readthedocs.io/en/stable/faq/#universal2 nicely describes the situation around arm64 vs universal2 wheels, in case it might be useful to anyone (in addition to the link you provided).