Update Poetry description

[MarieRoald]

Updates the description of Poetry to reflect their new support for PEP621.

[MarieRoald]

Poetry does not have documented support for different build backends, so while we got it working with setuptools in some simple tests, there are still non-standard features in Poetry that won’t work with anything else (like grouping mandatory dependencies). There might also be other things that will break Poetry with other build backends, but we don’t know what they might be. We therefore didn’t update the summary table with whether or not it supports switching out the build backend.

[willingc]

CI failure is an htmlproofer issue. The links to the Turing Way are valid.

[willingc]

Rerunning the build-test-book action in debug mode made things green.

[lwasser]

@all-contributors add @yngvem for code, review

[allcontributors[bot]]

@lwasser

I've put up a pull request to add @yngvem! :tada:

[lwasser]

@MarieRoald @yngvem it was so wonderful to meet you at our sprint and at the open space at PyCon! Please stay in touch with us!! We will be doing some more work on the packaging guide - adding UV (and pixi!) in the upcoming months as we discussed!!