chore(deps): update virtualenv requirement from >=21.4.2 to >=21.5.1 (#62)

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>21.5.1</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>🐛 fix(seed): refuse to seed unsupported Python versions by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/pypa/virtualenv/pull/3173">pypa/virtualenv#3173</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/pypa/virtualenv/compare/21.5.0...21.5.1">https://github.com/pypa/virtualenv/compare/21.5.0...21.5.1</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 - 21.5.1</h1>
<ul>
<li>Refuse to create environments whose Python the bundled wheels no
longer cover (currently below 3.9). virtualenv used
to substitute the newest bundled <code>pip</code>, which cannot run on
such a target, leaving a broken environment; seeder
selection now rejects it up front with a clear error.
<code>--no-seed</code> and third-party seeders that ship compatible
wheels still work - by :user:<code>gaborbernat</code>.
(:issue:<code>3171</code>)</li>
</ul>
<hr />
<p>v21.5.0 (2026-06-13)</p>
<hr />
<h1>Features - 21.5.0</h1>
<ul>
<li>Drop support for Python 3.8; virtualenv now requires Python 3.9 or
later to run and to create environments. Remove the
embedded <code>wheel</code> seed package, which virtualenv bundled only
for Python 3.8. The <code>--wheel</code> and <code>--no-wheel</code>
options stay as no-ops, but now warn that virtualenv will remove them in
a release after 2026-12 - by
:user:<code>gaborbernat</code>. (:issue:<code>3170</code>)</li>
</ul>
<h1>Bugfixes - 21.5.0</h1>
<ul>
<li>
<p>Upgrade embedded wheels:</p>
<p>Removed wheel of <code>0.47.0</code> (:issue:<code>u</code>)</p>
</li>
</ul>
<hr />
<p>v21.4.3 (2026-06-11)</p>
<hr />
<h1>Bugfixes - 21.4.3</h1>
<ul>
<li>
<p>Upgrade embedded wheels:</p>
<ul>
<li>pip to <code>26.1.2</code> from <code>26.1.1</code>
(:issue:<code>u</code>)</li>
</ul>
</li>
<li>
<p>Resolve executable-only symlinks when recording <code>home</code> and
<code>base-executable</code> in <code>pyvenv.cfg</code>, mirroring
CPython's
<code>getpath.realpath</code><code>python/cpython#115237</code>
binary locate the base stdlib (for example python-build-standalone); a
fully symlinked interpreter tree is kept as-is</p>
<ul>
<li>by :user:<code>gaborbernat</code>. (:issue:<code>3157</code>)</li>
</ul>
</li>
<li>
<p>Stop exporting <code>PS1</code> from the bash activator so child
processes do not inherit shell prompt state.
(:issue:<code>3158</code>)</p>
</li>
<li>
<p>Handle CYGWIN/MSYS/MINGW path conversions in fish activation script -
by user::<code>LuNoX</code>. (:issue:<code>3160</code>)</p>
</li>
</ul>
<hr />
<p>v21.4.2 (2026-05-31)</p>
<hr />
<p>Bugfixes - 21.4.2</p>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/virtualenv/commit/e1db75c64ff11daa1574df5d1bf565b46ae6ec6e"><code>e1db75c</code></a>
release 21.5.1</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/2bbb35c704dac0c816464da56da239cf2eeaf3a1"><code>2bbb35c</code></a>
🐛 fix(seed): refuse to seed unsupported Python versions (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3173">#3173</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/7042705b5f4eddbcace0830fcfd3bcfbddc25635"><code>7042705</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3172">#3172</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/90735e08d69325adc25765ef3498df5fac334c07"><code>90735e0</code></a>
release 21.5.0</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/79ce906a2378e24c81a7b27ac506c73d5cc262d9"><code>79ce906</code></a>
✨ feat: drop Python 3.8 support (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3170">#3170</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/f1f4d687b12caac079d81ffc5ee50a16d1fabc1a"><code>f1f4d68</code></a>
Upgrade embedded pip/setuptools/wheel (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3168">#3168</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/78df6f0873a89f8cc4ecb9378562e5eb74576e9f"><code>78df6f0</code></a>
Set git identity in upgrade changelog rename step (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3169">#3169</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/134b080fae08c8eac719750d21c3449d3aa02aaa"><code>134b080</code></a>
release 21.4.3</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/2a36128bef8914ad006b49e5f1e2ca431dafa1cf"><code>2a36128</code></a>
🐛 fix(discovery): resolve base interpreter executable-only symlinks (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3166">#3166</a>)</li>
<li><a
href="https://github.com/pypa/virtualenv/commit/5389c25cf4a1ee11ea55183d6daf4c8055dc3060"><code>5389c25</code></a>
Add wheel-0.47.0 to seed packages as mitigation of CVE-2026-24049 (<a
href="https://redirect.github.com/pypa/virtualenv/issues/3167">#3167</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pypa/virtualenv/compare/21.4.2...21.5.1">compare
view</a></li>
</ul>
</details>
<br />

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