build(deps): bump MSTest.TestFramework from 3.1.1 to 3.2.0 (#206)

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 3.1.1 to 3.2.0.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.1.1...v.3.2.0)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Directory.Build.props

@@ -46,7 +46,7 @@
   <ItemGroup Condition="$(IsTestProject)">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.2.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.1.1" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.2.0" />
     <PackageReference Include="coverlet.collector" Version="6.0.0" />
     <PackageReference Include="ReactiveMarbles.NuGet.Helpers" Version="1.1.1" />
     <PackageReference Include="ICSharpCode.Decompiler" Version="8.2.0.7535" />