Support automatic Python 3.12 PyPI trove classifier

[jakob-keller]

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Feature Request

Python 3.12 will be released later this year and is already available as a release candidate:

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0.

This would be made easier if poetry-core would automatically add the appropriate PyPI trove classifier.

I will draft a trivial PR in a minute.

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