Bump ui_test from 0.30.5 to 0.30.6 (#827)

Bumps [ui_test](https://github.com/oli-obk/ui_test) from 0.30.5 to
0.30.6.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/oli-obk/ui_test/blob/main/CHANGELOG.md">ui_test's
changelog</a>.</em></p>
<blockquote>
<h2>[0.30.6] - 2026-05-29</h2>
<h3>Added</h3>
<ul>
<li>Fields of <code>Errored</code> are now public, so user-defined flags
can report stdout/stderr</li>
</ul>
<h3>Fixed</h3>
<h3>Changed</h3>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/oli-obk/ui_test/commits">compare view</a></li>
</ul>
</details>
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