Bump MSTest from 3.10.3 to 3.10.4 (#119)

Updated [MSTest](https://github.com/microsoft/testfx) from 3.10.3 to
3.10.4.

<details>
<summary>Release notes</summary>

_Sourced from [MSTest's
releases](https://github.com/microsoft/testfx/releases)._

## 3.10.4

See the release notes
[here](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md#​3.10.4)


Commits viewable in [compare
view](microsoft/testfx@v3.10.3...v3.10.4).
</details>

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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="Azure.Deployments.Testing.Utilities" Version="1.473.0" />
     <PackageVersion Include="Microsoft.PowerPlatform.ResourceStack" Version="7.0.0.2076" />
     <PackageVersion Include="CommandLineParser" Version="2.9.1" />
-    <PackageVersion Include="MSTest" Version="3.10.3" />
+    <PackageVersion Include="MSTest" Version="3.10.4" />
     <PackageVersion Include="System.IO.Abstractions" Version="22.0.15" />
   </ItemGroup>
 </Project>