Poetry core update

[dimbleby]

updating poetry-core and making a series of tidy-ups, mostly as unblocked by that update

probably best reviewed commit by commit

[ralbertazzi]

It probably didn't need to be said, but I'll say it anyways since this PR is not explicitly included among the requirements for the 1.5 release: please make it part of the release 😄 Since this is the first release that, among performance improvements and better ways to define sources, should robustly support PyTorch, it would be a pity not to include python-poetry/poetry-core#579 (which is part of poetry-core 1.6) in the release

[Secrus]

It probably didn't need to be said, but I'll say it anyways since this PR is not explicitly included among the requirements for the 1.5 release: please make it part of the release smile Since this is the first release that, among performance improvements and better ways to define sources, should robustly support PyTorch, it would be a pity not to include python-poetry/poetry-core#579 (which is part of poetry-core 1.6) in the release

It actually is included in the release issue. We usually release poetry and poetry-core together.

[github-actions]

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