Bump pyo3 from 0.20.0 to 0.20.2 (#16791)

Bumps [pyo3](https://github.com/pyo3/pyo3) from 0.20.0 to 0.20.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pyo3/pyo3/releases">pyo3's
releases</a>.</em></p>
<blockquote>
<h2>PyO3 0.20.2</h2>
<p>This release corrects a failure to compile of the <code>either</code>
feature when the <code>experimental-inspect</code> feature is not
enabled.</p>
<p>It also adds backwards-compatibility for <code>pyo3</code> 0.20.0 to
build against <code>pyo3-build-config</code> 0.20.2, as
<code>pyo3</code> 0.20.0 was (unintentionally) not pinned against an
exact patch version <code>pyo3-build-config</code>, and
<code>pyo3</code> 0.20.0 could not build against
<code>pyo3-build-config</code> 0.20.1 due to an internal API
adjustment.</p>
<p>Thank you to the following users for the improvements:</p>
<p><a
href="https://github.com/adamreichold"><code>@​adamreichold</code></a>
<a
href="https://github.com/davidhewitt"><code>@​davidhewitt</code></a></p>
<h2>PyO3 0.20.1</h2>
<p>This release is a maintenance release to resolve <a
href="https://redirect.github.com/rust-lang/rust-clippy/issues/12039">a
clippy warning</a> which triggers on function arguments of
<code>Py&lt;Self&gt;</code>.</p>
<p>This release also contains a few minor API additions, including
optional support for the <code>either</code> and <code>smallvec</code>
crates.</p>
<p>Thank you to the following users for the improvements:</p>
<p><a
href="https://github.com/adamreichold"><code>@​adamreichold</code></a>
<a href="https://github.com/aldanor"><code>@​aldanor</code></a>
<a href="https://github.com/alex"><code>@​alex</code></a>
<a href="https://github.com/daemontus"><code>@​daemontus</code></a>
<a href="https://github.com/davidhewitt"><code>@​davidhewitt</code></a>
<a href="https://github.com/mejrs"><code>@​mejrs</code></a>
<a href="https://github.com/messense"><code>@​messense</code></a>
<a href="https://github.com/neachdainn"><code>@​neachdainn</code></a>
<a href="https://github.com/orhun"><code>@​orhun</code></a>
<a
href="https://github.com/suriya-ganesh"><code>@​suriya-ganesh</code></a>
<a href="https://github.com/wyfo"><code>@​wyfo</code></a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md">pyo3's
changelog</a>.</em></p>
<blockquote>
<h2>[0.20.2] - 2024-01-04</h2>
<h3>Packaging</h3>
<ul>
<li>Pin <code>pyo3</code> and <code>pyo3-ffi</code> dependencies on
<code>pyo3-build-config</code> to require the same patch version, i.e.
<code>pyo3</code> 0.20.2 requires <em>exactly</em>
<code>pyo3-build-config</code> 0.20.2. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3721">#3721</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fix compile failure when building <code>pyo3</code> 0.20.0 with
latest <code>pyo3-build-config</code> 0.20.X. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3724">#3724</a></li>
<li>Fix docs.rs build. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3722">#3722</a></li>
</ul>
<h2>[0.20.1] - 2023-12-30</h2>
<h3>Added</h3>
<ul>
<li>Add optional <code>either</code> feature to add conversions for
<code>either::Either&lt;L, R&gt;</code> sum type. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3456">#3456</a></li>
<li>Add optional <code>smallvec</code> feature to add conversions for
<code>smallvec::SmallVec</code>. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3507">#3507</a></li>
<li>Add <code>take</code> and <code>into_inner</code> methods to
<code>GILOnceCell</code> <a
href="https://redirect.github.com/PyO3/pyo3/pull/3556">#3556</a></li>
<li><code>#[classmethod]</code> methods can now also receive
<code>Py&lt;PyType&gt;</code> as their first argument. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3587">#3587</a></li>
<li><code>#[pyfunction(pass_module)]</code> can now also receive
<code>Py&lt;PyModule&gt;</code> as their first argument. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3587">#3587</a></li>
<li>Add <code>traverse</code> method to <code>GILProtected</code>. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3616">#3616</a></li>
<li>Added <code>abi3-py312</code> feature <a
href="https://redirect.github.com/PyO3/pyo3/pull/3687">#3687</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fix minimum version specification for optional <code>chrono</code>
dependency. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3512">#3512</a></li>
<li>Silenced new <code>clippy::unnecessary_fallible_conversions</code>
warning when using a <code>Py&lt;Self&gt;</code> <code>self</code>
receiver. <a
href="https://redirect.github.com/PyO3/pyo3/pull/3564">#3564</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/PyO3/pyo3/commit/bcef18b988a519aca93c29039fa0894a310d2eaf"><code>bcef18b</code></a>
release: 0.20.2</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/fa6d60b77ec67654b7639beccd794874a8ddc9eb"><code>fa6d60b</code></a>
Use a definite version specification when depending on
pyo3-build-config.</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/f9f0bdde702e794838ab521c8172c4744e663693"><code>f9f0bdd</code></a>
Merge pull request <a
href="https://redirect.github.com/pyo3/pyo3/issues/3724">#3724</a> from
davidhewitt/fix-build-config-issue</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/cf213252fa5c780503cb1772622a38d7b34cd874"><code>cf21325</code></a>
re-add emit_pyo3_cfgs for pyo3 0.20.0 compatibility</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/f7893858d2e01df03f2e711a811b95f08f8ca5e1"><code>f789385</code></a>
Merge pull request <a
href="https://redirect.github.com/pyo3/pyo3/issues/3722">#3722</a> from
PyO3/fix-doc-build</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/9120b35f3553c231797bf2dc357fcd4fe0bf5dec"><code>9120b35</code></a>
Include the experimental-inspect feature for the docs.rs build thereby
making...</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/2e79c557ccc628d4081661a712463e22fc780c92"><code>2e79c55</code></a>
Add CI job to test the equivalent of a docs.rs build.</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/2564ca4e7558396f166837d8795f8e1bfd698007"><code>2564ca4</code></a>
Fix missing feature flags in implementation of Either conversion.</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/be4d5627a33bc3575e3811e68c3366a9e264db77"><code>be4d562</code></a>
Merge pull request <a
href="https://redirect.github.com/pyo3/pyo3/issues/3713">#3713</a> from
PyO3/release-0.20.1</li>
<li><a
href="https://github.com/PyO3/pyo3/commit/d3f034a80f2973e4d21fc2fd49cd0af309f1ab4d"><code>d3f034a</code></a>
release: 0.20.1</li>
<li>Additional commits viewable in <a
href="https://github.com/pyo3/pyo3/compare/v0.20.0...v0.20.2">compare
view</a></li>
</ul>
</details>
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