Bump submodules/undocked from ff9f2b4 to d2721ee (#88)

Bumps [submodules/undocked](https://github.com/microsoft/undocked) from
`ff9f2b4` to `d2721ee`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/undocked/commit/d2721ee8bede0a14251304d66b96fea39a74a948"><code>d2721ee</code></a>
Bump actions/checkout from 4.2.1 to 4.2.2 (<a
href="https://redirect.github.com/microsoft/undocked/issues/43">#43</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/undocked/compare/ff9f2b473e116306afae478f6372e0557d170e42...d2721ee8bede0a14251304d66b96fea39a74a948">compare
view</a></li>
</ul>
</details>
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