Upgrade pyproject.toml to Poetry v2 format (#215)

Migrate from [tool.poetry] to [project]
https://python-poetry.org/blog/announcing-poetry-2.0.0
https://python-poetry.org/docs/faq/#migrate-pep621-new-static

Use dynamic Poetry classifiers and dependencies,
more convenient but less generic to pyproject.toml project

Use full names
Remove s_b from the authors,
I couldn’t find a commit from him with shortlog
His activity on the forum:
https://forum.duniter.org/t/python-how-to-use-the-ucoin-python-api/528