Bump the microsoft group with 1 update

Bumps the microsoft group with 1 update: [MSTest.TestAdapter](https://github.com/microsoft/testfx).


Updates `MSTest.TestAdapter` 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
  dependency-group: microsoft
...

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

src/Directory.Packages.props

@@ -4,7 +4,7 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="3.2.0" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.2.1" />
     <PackageVersion Include="MSTest.TestFramework" Version="3.2.1" />
   </ItemGroup>
 </Project>