added python 3.11 workflow

[kliem]

This tests (and shall eventually fix) #6

[kliem]

Just trying to copy from zeromq/pyzmq#1657.

[kliem]

I was able to reproduce the failure here: kliem#1.

So maybe it makes sense to force the version of the dependencies for the workflow, so that we will see incompatibilities.

@mkoeppe What do you think. Make a prerelease and test it with https://trac.sagemath.org/ticket/33842?

[mkoeppe]

Make a prerelease and test it with https://trac.sagemath.org/ticket/33842?

Yes, sounds good

[kliem]

A bit of testing is useful. Turns out that cython version 0.29.28 does not suffice, but 0.29.30 is needed.

[kliem]

@videlec
This pull request also raises required cython version to 0.29.30.
I guess one could also do a conditional requirement as explained here:
https://peps.python.org/pep-0631/#example

This would then be something like?
requires = ["setuptools", "wheel", "Cython", 'Cython>=0.29.30; python_version > "3.10"']

[videlec]

Indeed. Ubuntu 20.04 ships Python 3.8.2 and Cython 0.29.4. It seems safe to only have the Cython requirement for Python version > 3.10.