Update Rust crate pyo3 to 0.20.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pyo3	dependencies	patch	0.20.1 -> 0.20.2

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Release Notes

pyo3/pyo3 (pyo3)

v0.20.2: PyO3 0.20.2

Compare Source

This release corrects a failure to compile of the either feature when the experimental-inspect feature is not enabled.

It also adds backwards-compatibility for pyo3 0.20.0 to build against pyo3-build-config 0.20.2, as pyo3 0.20.0 was (unintentionally) not pinned against an exact patch version pyo3-build-config, and pyo3 0.20.0 could not build against pyo3-build-config 0.20.1 due to an internal API adjustment.

Thank you to the following users for the improvements:

@​adamreichold
@​davidhewitt

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