Update pyo3 requirement from 0.20.3 to 0.21.2

[dependabot]

Updates the requirements on pyo3 to permit the latest version.

Release notes

Sourced from pyo3's releases.

PyO3 0.20.3

This is a stability & compatibility release to fix a couple of minor compilation edge cases from PyO3 0.20.2.

The portable-atomic dependency has been added to resolve compile failures on platforms without 64-bit atomic support.

A maximum Python version check (currently for Python 3.12) has been added to prevent using old PyO3 code against future Python versions beyond the supported range.

Thank you to the following users for the improvements:

@​adamreichold @​davidhewitt

Changelog

Sourced from pyo3's changelog.

[0.20.3] - 2024-02-23

Packaging

• Add portable-atomic dependency. #3619
• Check maximum version of Python at build time and for versions not yet supported require opt-in to the abi3 stable ABI by the environment variable PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1. #3821

Fixed

• Use portable-atomic to support platforms without 64-bit atomics. #3619
• Fix compilation failure with either feature enabled without experimental-inspect enabled. #3834

[0.20.2] - 2024-01-04

Packaging

• Pin pyo3 and pyo3-ffi dependencies on pyo3-build-config to require the same patch version, i.e. pyo3 0.20.2 requires exactly pyo3-build-config 0.20.2. #3721

Fixed

• Fix compile failure when building pyo3 0.20.0 with latest pyo3-build-config 0.20.X. #3724
• Fix docs.rs build. #3722

[0.20.1] - 2023-12-30

Added

• Add optional either feature to add conversions for either::Either<L, R> sum type. #3456
• Add optional smallvec feature to add conversions for smallvec::SmallVec. #3507
• Add take and into_inner methods to GILOnceCell #3556
• #[classmethod] methods can now also receive Py<PyType> as their first argument. #3587
• #[pyfunction(pass_module)] can now also receive Py<PyModule> as their first argument. #3587
• Add traverse method to GILProtected. #3616
• Added abi3-py312 feature #3687

Fixed

• Fix minimum version specification for optional chrono dependency. #3512
• Silenced new clippy::unnecessary_fallible_conversions warning when using a Py<Self> self receiver. #3564

[0.20.0] - 2023-10-11

Packaging

• Dual-license PyO3 under either the Apache 2.0 OR the MIT license. This makes the project GPLv2 compatible. #3108
• Update MSRV to Rust 1.56. #3208
• Bump indoc dependency to 2.0 and unindent dependency to 0.2. #3237
• Bump syn dependency to 2.0. #3239
• Drop support for debug builds of Python 3.7. #3387

... (truncated)

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