Bump submodules/undocked from d2721ee to e8441c0 (#90)

Bumps [submodules/undocked](https://github.com/microsoft/undocked) from
`d2721ee` to `e8441c0`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/undocked/commit/e8441c0f2b9e0f8e3268eac20196338d538846ab"><code>e8441c0</code></a>
Set msbuild.exe arch to x64 to avoid issues with nuget wdk (<a
href="https://redirect.github.com/microsoft/undocked/issues/46">#46</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/undocked/compare/d2721ee8bede0a14251304d66b96fea39a74a948...e8441c0f2b9e0f8e3268eac20196338d538846ab">compare
view</a></li>
</ul>
</details>
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