chore(deps): update rstest requirement from 0.19.0 to 0.21.0 (#1149)

Updates the requirements on [rstest](https://github.com/la10736/rstest)
to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/la10736/rstest/releases">rstest's
releases</a>.</em></p>
<blockquote>
<p>Introduce MSRV and minor fixes</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/la10736/rstest/blob/master/CHANGELOG.md">rstest's
changelog</a>.</em></p>
<blockquote>
<h2>[0.19.0] 2024/4/9</h2>
<h3>Changed</h3>
<ul>
<li>Defined <code>rust-version</code> for each crate (see <a
href="https://github.com/la10736/rstest/issues/227">#227</a>)</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>
<p><code>#[once]</code> fixtures now require the returned type to be
<a
href="https://doc.rust-lang.org/std/marker/trait.Sync.html"><code>Sync</code></a>
to prevent UB
when tests are executed in parallel. (see <a
href="https://github.com/la10736/rstest/issues/235">#235</a>
for more details)</p>
</li>
<li>
<p><code>#[future(awt)]</code> and <code>#[awt]</code> now properly
handle mutable (<code>mut</code>) parameters by treating futures as
immutable and
treating the awaited rebinding as mutable.</p>
</li>
</ul>
<h2>[0.18.2] 2023/8/13</h2>
<h3>Changed</h3>
<ul>
<li>Now <code>#[files]</code> accept also parent folders (see <a
href="https://github.com/la10736/rstest/issues/205">#205</a>
for more details).</li>
</ul>
<h2>[0.18.1] 2023/7/5</h2>
<h3>Fixed</h3>
<ul>
<li>Wrong doc test</li>
<li>Docs</li>
</ul>
<h2>[0.18.0] 2023/7/4</h2>
<h3>Add</h3>
<ul>
<li>Add support for <code>RSTEST_TIMEOUT</code> environment variable to
define a max timeout
for each function (see <a
href="https://github.com/la10736/rstest/issues/190">#190</a>
for details).
Thanks to <a
href="https://github.com/aviramha"><code>@​aviramha</code></a> for idea
and PR</li>
<li><code>#[files(&quot;glob path&quot;)]</code> attribute to generate
tests based on files that
satisfy the given glob path (see <a
href="https://github.com/la10736/rstest/issues/163">#163</a>
for details).</li>
</ul>
<h3>Changed</h3>
<ul>
<li>Switch to <code>syn</code> 2.0 and edition 2021 : minimal Rust
version now is 1.56.0
both for <code>rstest</code> and <code>rstest_reuse</code> (see <a
href="https://github.com/la10736/rstest/issues/187">#187</a>)</li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fixed wired behavior on extraction <code>#[awt]</code> function
attrs (See
<a
href="https://github.com/la10736/rstest/issues/189">#189</a>)</li>
</ul>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/la10736/rstest/compare/v0.19.0...v0.19.0">compare
view</a></li>
</ul>
</details>
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Cargo.toml

@@ -44,7 +44,7 @@ proptest = "1.4.0"
 proptest-derive = "0.4.0"
 regex = "1.9.5"
 regex-syntax = "0.8.3"
-rstest = "0.19.0"
+rstest = "0.21.0"
 serde = "1.0"
 serde_json = "1.0.97"
 serde_yaml = "0.9.19"