Cargo.toml: Update PyO3 to 0.22.1

[EwoutH]

Updates the PyO3 dependency to 0.22.1 in Cargo.toml. This should help with Python 3.13 compatibility.

[EwoutH]

I have no idea about the CI failures. There is a migration guide for PyO3, it might be helpful: https://pyo3.rs/v0.22.1/migration

[edgarrmondragon]

@EwoutH you might wanna take a look at crate-py/rpds#79 for a similar migration to PyO3 0.22.1

I see you commented there 😅

[EwoutH]

Thanks for the reference! Unfortunately, I can't fix this myself, I'm not a Rust dev. Just following the rabbit hole of upstream dependencies.

I hope anyone would be able to work on this!

[samuelcolvin]

you'll need to update Cargo.lock too.

I would say these are real compatibility issues related to the new PyO3 API that will need to be fixed.

[EwoutH]

Thanks, I'm going to close this PR, since I'm not going to be able to fix it. We can use #276 to track this issue further.