Update PyO3 to 0.29

[musicinmybrain]

Pull Request Check List

• Added tests for changed code. N/A
• Updated documentation for changed code. N/A

See https://pyo3.rs/v0.29.0/changelog.html, and note that PyO3 0.29 fixes https://rustsec.org/advisories/RUSTSEC-2026-0176.html and https://rustsec.org/advisories/RUSTSEC-2026-0177.html.

Note also that since PyO3 0.29, the generate-import-lib feature is deprecated and no longer has any effect; it is present only for backward-compatibility. See PyO3/pyo3#5866.

The source-code changes avoids the following warning:

warning: use of deprecated associated constant `pyo3::impl_::deprecated::HasAutomaticFromPyObject::<true>::MSG`: The `FromPyObject` implementation for `#[pyclass]` types which implement `Cl
one` is changing to an opt-in option. Use `#[pyclass(from_py_object)]` to opt-in to the `FromPyObject` derive now, or `#[pyclass(skip_from_py_object)]` to skip the `FromPyObject` implementation.
 --> src/python/types/timezone.rs:5:1
  |
5 | #[pyclass(module = "_pendulum", extends = PyTzInfo)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default
  = note: this warning originates in the attribute macro `pyclass` (in Nightly builds, run with -Z macro-backtrace for more info)

[codspeed-hq]

Merging this PR will not alter performance

✅ 1 untouched benchmark

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_{Comparing musicinmybrain:pyo3-0.29 (cc32cba) with master (cbab60c)}