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As the title says, this MR updates Poetry to version 1.4.2.
It revealed necessary due to a breaking change in the PyPI API that was leaving the poetry.lock metadata.files table empty. Instead of staying on an old and unpinned version, this commit updates Poetry to the latest stable version and pins it.
Note that it introduces a new poetry.lock version (2.0) that requires a modern Poetry version. Update your installations (and clean your caches)!