Bump to pyo3 0.25

[kylebarron]

Thank you for contributing to pyo3-async-runtimes!

Please consider adding the following to your pull request:

• an entry in CHANGELOG.md
• docs to all new functions and / or detail in the guide
• tests for all new or changed functions

Be aware the CI pipeline will check your pull request for the following:

• Rust tests (Just cargo test)
• Rust lints (make clippy)
• Rust formatting (cargo fmt)
• Python formatting (black . --check. You can install black with pip install black)

[cjdsellers]

Thanks @kylebarron 🙏

[kylebarron]

Would you be able to push a new release?

[cjdsellers]

@kylebarron — sure! I’ll sync with @davidhewitt first to confirm the release procedure and any other considerations.

[jessekrubin]

@kylebarron saves the day!

[cjdsellers]

It looks like @davidhewitt is the crate owner, so I don't have a token to be able to publish.

I think we're also manually git-tagging and pushing a release: 0.25 commit at the same time?

I’ll stand by for confirmation.