Bump MSTest.TestAdapter from 3.2.0 to 3.2.1 in /GraphEngine.Tests

Bumps [MSTest.TestAdapter](https://github.com/microsoft/testfx) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v.3.2.0...v3.2.1)

---
updated-dependencies:
- dependency-name: MSTest.TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

GraphEngine.Tests/GraphEngine.Tests.csproj

@@ -15,7 +15,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.2.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.2.1" />
     <PackageReference Include="MSTest.TestFramework" Version="3.2.1" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">
       <PrivateAssets>all</PrivateAssets>