Update pytest-asyncio requirement from <=0.21.1 to <=0.21.2 in /backend (#672)

Updates the requirements on
[pytest-asyncio](https://github.com/pytest-dev/pytest-asyncio) to permit
the latest version.
<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 0.21.2</h2>
<h1>0.21.2 (2024-04-29)</h1>
<ul>
<li>Fix compatibility with pytest 8.2. Backport of <a
href="https://redirect.github.com/pytest-dev/pytest-asyncio/pull/800">#800</a>
to pytest-asyncio v0.21 for users who are unable to upgrade to a more
recent version (see <a
href="https://redirect.github.com/pytest-dev/pytest-asyncio/pull/706">#706</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="12de7f6c7d"><code>12de7f6</code></a>
[ci] Do not fail CI pipeline, if coverage upload fails.</li>
<li><a
href="b4aebfbd32"><code>b4aebfb</code></a>
[test] Addresses a Hypothesis health check that leads to failing
tests.</li>
<li><a
href="ef6144a41c"><code>ef6144a</code></a>
[refactor] Satisfy linters.</li>
<li><a
href="df294815c7"><code>df29481</code></a>
[docs] Added changelog entry.</li>
<li><a
href="2fb3b19ade"><code>2fb3b19</code></a>
Backported <a
href="https://redirect.github.com/pytest-dev/pytest-asyncio/issues/800">#800</a>
to the 0.21.1 tag</li>
<li><a
href="a10cbde05f"><code>a10cbde</code></a>
[docs] Fixed typo.</li>
<li><a
href="82b010d686"><code>82b010d</code></a>
[docs] Add release date of v0.21.1 to changelog.</li>
<li><a
href="af08b1c70d"><code>af08b1c</code></a>
[test] Removed obsolete test &quot;test_async_close_loop&quot;.</li>
<li><a
href="79b2d1aed3"><code>79b2d1a</code></a>
[test] Added a test case which verifies compatibility with pytest.skip
in aut...</li>
<li><a
href="39a97548bf"><code>39a9754</code></a>
[test] The test that asserts compatibility with pytest.mark.skip reports
succ...</li>
<li>Additional commits viewable in <a
href="https://github.com/pytest-dev/pytest-asyncio/compare/v0.1.1...v0.21.2">compare
view</a></li>
</ul>
</details>
<br />

<details>
<summary>Most Recent Ignore Conditions Applied to This Pull
Request</summary>

| Dependency Name | Ignore Conditions |
| --- | --- |
| pytest-asyncio | [>= 0.23.a, < 0.24] |
</details>


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backend/Pipfile

@@ -38,7 +38,7 @@ mypy = ">=1.3.1"
 pluggy = "<=1.5.0"
 pylint = ">=2.15.10"
 pytest = "<=8.1.1"
-pytest-asyncio = "<=0.21.1"
+pytest-asyncio = "<=0.21.2"
 pytest-cov = ">=4.0.0"
 pytest-xdist = ">=3.2.1"
 ruff = ">=0.0.292"