chore(deps): update dependency microsoft.testing.platform.msbuild to 2.1.0 (#4286)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[Microsoft.Testing.Platform.MSBuild](https://redirect.github.com/microsoft/testfx)
| `2.0.2` → `2.1.0` |
![age](https://developer.mend.io/api/mc/badges/age/nuget/Microsoft.Testing.Platform.MSBuild/2.1.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Microsoft.Testing.Platform.MSBuild/2.0.2/2.1.0?slim=true)
|

---

### Release Notes

<details>
<summary>microsoft/testfx (Microsoft.Testing.Platform.MSBuild)</summary>

###
[`v2.1.0`](https://redirect.github.com/microsoft/testfx/releases/tag/v2.1.0)

See release notes
[here](https://redirect.github.com/microsoft/testfx/blob/main/docs/Changelog.md#210---2020-02-03).

</details>

---

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src/Directory.Packages.props

@@ -26,7 +26,7 @@
     <PackageVersion Include="Microsoft.Extensions.DependencyModel" Version="10.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.4.1" />
-    <PackageVersion Include="Microsoft.Testing.Platform.MSBuild" Version="2.0.2" />
+    <PackageVersion Include="Microsoft.Testing.Platform.MSBuild" Version="2.1.0" />
     <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.1.0" />
     <PackageVersion Include="System.Reactive" Version="6.1.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.102" />