use pyo3 0.28.2 and support python 3.14 issue#51

[ensignavenger]

This may be messy, I tried to clean it up. It is not passing pytest... and I am not sure how to fix it. As stated in issue #51, I don't have any Rust experience. Submitting the pull request for review and feedback and maybe help of those wiser than I.

[divarvel]

The issue seems to be coming from this change https://github.com/eclipse-biscuit/biscuit-python/pull/52/changes#diff-b1a35a68f14e696205874893c07fd24fdb88882b47c23cc0e0c80a30c7d53759R1346

Since PyDate now wraps a PyAny, it will always succeed in FromPyObject and as such always be picked before PyBytes in NestedPyTerm’s FromPyObject impl.

[divarvel]

I see FromPyObject is implemented for OffsetDateTime, you could try replacing PyDateTime by this and seeing if that works. Pay attention to the time offset, make sure that the test covers it, don’t hesitate to update them if necessary.

[ensignavenger]

Simply reverting that change to the original seems to have fixed it... is that acceptable?