Make a new release supporting Python 3.10

[espenfl]

Would it be possible to make a new release supporting Python 3.10, with this fix included: #1170? Thanks for considering.

[espenfl]

@k4nar Have you had time to look into this? Would be sweet to get a bugfix release out now that Python 3.10 is geting picked up as the default by a few distributions.

[sphuber]

@k4nar it would be great if you or someone else could have a look at this. This is currently blocking our project https://github.com/aiidateam/aiida-core and its entire plugin ecosystem. Is there anything blocking making the release? Let me know if there is a way I can lend a hand. Thanks a lot.

[sphuber]

I have just pushed a new release v0.17.2 that includes the fix for #1170 (https://pypi.org/project/circus/0.17.2/) . The tests are not actually running on Python 3.10 yet, because they are still running on nose which doesn't support it, and it has been abandoned: nose-devs/nose#1099

I opened #1192 and will move to pytest. Once that is done, I can add official support for Python 3.10 with tests running against this version in the CI workflow.