Bump Microsoft.NET.Test.Sdk from 17.4.0 to 17.4.1 in /UnitTests (#259)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 17.4.0 to 17.4.1.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.4.0...v17.4.1)

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

UnitTests/UnitTests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\src\Microsoft.IO.RecyclableMemoryStream.csproj" />