Bump pipx from 1.2.0 to 1.2.1 (#540)

Bumps [pipx](https://github.com/pypa/pipx) from 1.2.0 to 1.2.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pypa/pipx/releases">pipx's
releases</a>.</em></p>
<blockquote>
<h2>1.2.1</h2>
<p>Note: This is a non-main release to only contain fix for the new
packaging release on top of 1.2.0 without additional changes.</p>
<ul>
<li>Fix compatibility to packaging 23.2+ by removing reliance on
packaging's requirement validation logic and detecting a URL-based
requirement in pipx. (<a
href="https://redirect.github.com/pypa/pipx/issues/1070">#1070</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pypa/pipx/blob/main/CHANGELOG.md">pipx's
changelog</a>.</em></p>
<blockquote>
<h2>1.2.1</h2>
<ul>
<li>Fix compatibility to packaging 23.2+ by removing reliance on
packaging's requirement validation logic and detecting a URL-based
requirement in pipx. (<a
href="https://redirect.github.com/pypa/pipx/issues/1070">#1070</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/pipx/commit/331a581a41d71e2b29d64d05de3b59cfb002acea"><code>331a581</code></a>
Pre-release 1.2.1</li>
<li><a
href="https://github.com/pypa/pipx/commit/1a5e912481573a1ae129312f057ce6a3bf42a97c"><code>1a5e912</code></a>
Add changelog for backported change</li>
<li><a
href="https://github.com/pypa/pipx/commit/095ddd274e5766e014e36c9d846950c301e61eb9"><code>095ddd2</code></a>
Manually parse URL without depending on packaging (<a
href="https://redirect.github.com/pypa/pipx/issues/1071">#1071</a>)</li>
<li>See full diff in <a
href="https://github.com/pypa/pipx/compare/1.2.0...1.2.1">compare
view</a></li>
</ul>
</details>
<br />

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