Update Rust crate pyo3 to 0.21.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pyo3	dependencies	patch	0.21.1 -> 0.21.2

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Release Notes

pyo3/pyo3 (pyo3)

v0.21.2: PyO3 0.21.2

Compare Source

This release contains some fixes to compile-time edge cases for the PyO3 0.21 series:

• A missing deprecation warning for the GIL Ref constructor PySet::empty has now been added.
• #[pymodule] functions will no longer trigger missing_docs lints on their generated code.
• Incorrect implementations of __traverse__ in #[pymethods] will now emit a better error.
• Extension modules on AIX will now link to libpython.

This release also fixes some compile errors for the experimental-async and experimental-declarative-modules features, and corrects some documentation typos.

Thank you to the following users for the improvements:

@​adamreichold
@​blmarket
@​davidhewitt
@​Icxolu
@​lfn3
@​messense
@​wyfo

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