Bump pytest-asyncio from 0.21.0 to 0.21.1 (#570)

Bumps [pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio)
from 0.21.0 to 0.21.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pytest-dev/pytest-asyncio/releases">pytest-asyncio's
releases</a>.</em></p>
<blockquote>
<h2>pytest-asyncio 0.21.1</h2>
<h1>0.21.1 (2023-07-12)</h1>
<ul>
<li>Output a proper error message when an invalid
<code>asyncio_mode</code> is selected.</li>
<li>Extend warning message about unclosed event loops with additional
possible cause.
<a
href="https://redirect.github.com/pytest-dev/pytest-asyncio/issues/531">#531</a></li>
<li>Previously, some tests reported &quot;skipped&quot; or
&quot;xfailed&quot; as a result. Now all tests report a
&quot;success&quot; result.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/a10cbde05ff46b44f37a79b937a8dd38230f232a"><code>a10cbde</code></a>
[docs] Fixed typo.</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/82b010d6869b9c2330bcfaa551fc8fe4719f45a8"><code>82b010d</code></a>
[docs] Add release date of v0.21.1 to changelog.</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/af08b1c70dee405956437521082ae01b16b8a8df"><code>af08b1c</code></a>
[test] Removed obsolete test &quot;test_async_close_loop&quot;.</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/79b2d1aed3d31e0f95e7d97e6176ff6b82f62635"><code>79b2d1a</code></a>
[test] Added a test case which verifies compatibility with pytest.skip
in aut...</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/39a97548bfb0fe0de9527a98563037cb1ce80899"><code>39a9754</code></a>
[test] The test that asserts compatibility with pytest.mark.skip reports
succ...</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/a26b6dd571c7c037d9e91f9f1687fc0246571358"><code>a26b6dd</code></a>
[test] Added a test case which verifies compatibility with
pytest.mark.xfail ...</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/7fa36f24f406ea65b4281444efdd3ef4a4e9f353"><code>7fa36f2</code></a>
[test] The test that asserts compatibility with pytest.mark.xfail
reports suc...</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/df8811906d0e3aa6171a39beee9373e84883790e"><code>df88119</code></a>
[docs] Improved readbility of headings on the fixtures reference in the
docs.</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/75a1a6ce4bdffb749527bc8e4f756e6e5f36f1b8"><code>75a1a6c</code></a>
[feat] Extend warning message about unclosed event loops with additional
poss...</li>
<li><a
href="https://github.com/pytest-dev/pytest-asyncio/commit/1821542b5126bee0c597c0f547e528791f3f6856"><code>1821542</code></a>
[docs] Explain that scopes of event_loop fixtures should not
overlap.</li>
<li>Additional commits viewable in <a
href="https://github.com/pytest-dev/pytest-asyncio/compare/v0.21.0...v0.21.1">compare
view</a></li>
</ul>
</details>
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