Update Rust crate pyo3 to 0.21.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pyo3	dependencies	patch	0.21.0 -> 0.21.1

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Release Notes

pyo3/pyo3 (pyo3)

v0.21.1

Compare Source

Added

• Implement Send and Sync for PyBackedStr and PyBackedBytes. #​4007
• Implement Clone, Debug, PartialEq, Eq, PartialOrd, Ord and Hash implementation for PyBackedBytes and PyBackedStr, and Display for PyBackedStr. #​4020
• Add import_exception_bound! macro to import exception types without generating GIL Ref functionality for them. #​4027

Changed

• Emit deprecation warning for uses of GIL Refs as #[setter] function arguments. #​3998
• Add #[inline] hints on many Bound and Borrowed methods. #​4024

Fixed

• Handle #[pyo3(from_py_with = "")] in #[setter] methods #​3995
• Allow extraction of &Bound in #[setter] methods. #​3998
• Fix some uncovered code blocks emitted by #[pymodule], #[pyfunction] and #[pyclass] macros. #​4009
• Fix typo in the panic message when a class referenced in pyo3::import_exception! does not exist. #​4012
• Fix compile error when using an async #[pymethod] with a receiver and additional arguments. #​4015

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