Bump Microsoft.TestPlatform.ObjectModel from 17.5.0 to 17.6.0

Bumps [Microsoft.TestPlatform.ObjectModel](https://github.com/microsoft/vstest) from 17.5.0 to 17.6.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.5.0...v17.6.0)

---
updated-dependencies:
- dependency-name: Microsoft.TestPlatform.ObjectModel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Tests/Directory.Build.props

@@ -8,7 +8,7 @@
     </PackageReference>
     <PackageReference Include="JunitXml.TestLogger" Version="3.0.124" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
-    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.5.0" />
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.6.0" />
     <PackageReference Include="Moq" Version="4.18.4" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" PrivateAssets="All" Version="2.4.5">