Update release mechanism for 2FA on pypi

[james-d-mitchell]

I read something on reddit that pypi are making 2FA mandatory by the end of 2023:

https://blog.pypi.org/posts/2023-05-25-securing-pypi-with-2fa/

We'll probably need to update the CI that runs when we make a release to accommodate this, on quick inspection I think the route to go is the "trusted publishers".

[james-d-mitchell]

I recently re-enabled the pypi publish on release in gaplint:

james-d-mitchell/gaplint#36