Bump python-discovery from 1.5.3 to 1.6.0 (#13617)

Bumps [python-discovery](https://github.com/tox-dev/python-discovery)
from 1.5.3 to 1.6.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/python-discovery/releases">python-discovery's
releases</a>.</em></p>
<blockquote>
<h2>v1.6.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>✨ feat(py_info): add system_exe, a narrowed system executable by <a
href="https://github.com/gaborbernat"><code>@​gaborbernat</code></a> in
<a
href="https://redirect.github.com/tox-dev/python-discovery/pull/127">tox-dev/python-discovery#127</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/python-discovery/compare/1.5.3...1.6.0">https://github.com/tox-dev/python-discovery/compare/1.5.3...1.6.0</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/python-discovery/blob/main/docs/changelog.rst">python-discovery's
changelog</a>.</em></p>
<blockquote>
<h1>Features - 1.6.0</h1>
<ul>
<li>:attr:<code>~python_discovery.PythonInfo.system_exe</code> returns
the executable of the system Python an interpreter is based on,
falling back to
:attr:<code>~python_discovery.PythonInfo.executable</code> the way
:meth:<code>~python_discovery.PythonInfo.resolve_to_system</code> does.
:attr:<code>~python_discovery.PythonInfo.system_executable</code> is
<code>None</code> until resolution runs, so every consumer had to narrow
a value discovery has already settled - by
:user:<code>gaborbernat</code>. (:issue:<code>127</code>)</li>
</ul>
<hr />
<p>v1.5.3 (2026-08-24)</p>
<hr />
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/python-discovery/commit/ba1a07280dcb842a8bf49b26cd9edc5bd524d691"><code>ba1a072</code></a>
release 1.6.0</li>
<li><a
href="https://github.com/tox-dev/python-discovery/commit/c9f4e8586bf94d3d094375e4037ab99f2f88e1bf"><code>c9f4e85</code></a>
✨ feat(py_info): add system_exe, a narrowed system executable (<a
href="https://redirect.github.com/tox-dev/python-discovery/issues/127">#127</a>)</li>
<li><a
href="https://github.com/tox-dev/python-discovery/commit/0ef757b00a6f859529193eec31667f0ccc8b833b"><code>0ef757b</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/python-discovery/issues/126">#126</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/python-discovery/compare/1.5.3...1.6.0">compare
view</a></li>
</ul>
</details>
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