Update virtualenv requirement from >=21.3.1 to >=21.4.2 (#58)HEADmain

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Updates the requirements on
[virtualenv](https://github.com/pypa/virtualenv) to permit the latest
version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pypa/virtualenv/releases">virtualenv's
releases</a>.</em></p>
<blockquote>
<h2>21.4.2</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>🐛 fix(activation): silence deactivate hash -r under set -e by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/pypa/virtualenv/pull/3152">pypa/virtualenv#3152</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/pypa/virtualenv/compare/21.4.1...21.4.2">https://github.com/pypa/virtualenv/compare/21.4.1...21.4.2</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pypa/virtualenv/blob/main/docs/changelog.rst">virtualenv's
changelog</a>.</em></p>
<blockquote>
<h1>Bugfixes - 21.4.2</h1>
<ul>
<li>Stop <code>deactivate</code> in the bash/zsh activation script from
aborting under <code>set -e</code> when <code>hash -r</code> fails (for
example with shell hashing disabled) by appending <code>|| true</code>,
matching CPython <code>venv</code> (<a
href="https://redirect.github.com/pypa/virtualenv/issues/149701">gh-149701</a>)
and the existing
non-deactivate call - by :user:<code>gaborbernat</code>.
(:issue:<code>3152</code>)</li>
</ul>
<hr />
<p>v21.4.1 (2026-05-28)</p>
<hr />
<h1>Bugfixes - 21.4.1</h1>
<ul>
<li>Fix Windows debug build <code>venvlauncher_d.exe</code> substitution
never triggering because <code>executables()</code> compared the
source executable name instead of the target name, and fix
<code>AttributeError</code> on <code>debug_build</code> attribute for
interpreter info objects missing the field - by
:user:<code>gaborbernat</code>. (:issue:<code>3151</code>)</li>
</ul>
<hr />
<p>v21.4.0 (2026-05-28)</p>
<hr />
<h1>Features - 21.4.0</h1>
<ul>
<li>Remove dead code targeting Python versions below the supported
target range (PyPy 3.6, deprecated importlib APIs) and
simplify the runtime import hook in <code>_virtualenv.py</code> - by
:user:<code>gaborbernat</code>. (:issue:<code>3149</code>)</li>
<li>Support Windows debug builds (<code>python_d.exe</code>,
<code>venvlauncher_d.exe</code>) matching CPython venv behavior, remove
dead
<code>__SCRIPT_DIR__</code> replacement and <code>has_shim</code>
version guard, drop unreachable Python 3.7 branch from
<code>pyvenv_launch_patch_active</code>, and fix wheel deprecation
message to say <code>&gt;= 3.9</code> - by
:user:<code>gaborbernat</code>.
(:issue:<code>3150</code>)</li>
</ul>
<hr />
<p>v21.3.3 (2026-05-13)</p>
<hr />
<h1>Bugfixes - 21.3.3</h1>
<ul>
<li>recognize GraalPy interpreters using the normalized
<code>GraalPy</code> name - by :user:<code>timfel</code>.
(:issue:<code>3144</code>)</li>
</ul>
<hr />
<p>v21.3.2 (2026-05-12)</p>
<hr />
<p>No significant changes.</p>
<hr />
<p>v21.3.1 (2026-05-05)</p>
<hr />
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/virtualenv/commit/3cf1a29a24ad7f93ecd2db8c7fbbf454a3607694"><code>3cf1a29</code></a>
release 21.4.2</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/b724203e38ca810dc682126435c3ba756a8bd943"><code>b724203</code></a>
🐛 fix(activation): silence deactivate hash -r under set -e (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3152">#3152</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/e88f194c574fba787a9f44a0568042974d45a539"><code>e88f194</code></a>
release 21.4.1</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/6a2d79cd8077035a8a9d08b8501975eead13b496"><code>6a2d79c</code></a>
🐛 fix(create): debug build venvlauncher lookup on Windows 3.13+ (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3151">#3151</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/30bcf62a65d262b85f3272a7f9b91397f712a13b"><code>30bcf62</code></a>
release 21.4.0</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/61434984154e4474c478301e433071efd880ad8c"><code>6143498</code></a>
✨ feat(create): support Windows debug builds and remove dead code (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3150">#3150</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/ceaf88f8736c253ca71d155bb08b8475deebda02"><code>ceaf88f</code></a>
♻️ refactor(create): remove dead code and document droppable paths (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3149">#3149</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/d423ddcce98ad1c5b4529d2c9e947a7ccf09a968"><code>d423ddc</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3148">#3148</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/f4a793600df5a660190fb55c57b9eed84fb09d68"><code>f4a7936</code></a>
Fix Mermaid flowchart rendering (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3147">#3147</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/7189e8e018f3390f6ce217f2fe21a55af26f441e"><code>7189e8e</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3145">#3145</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pypa/virtualenv/compare/21.3.1...21.4.2">compare
view</a></li>
</ul>
</details>
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