Bump Microsoft.TestPlatform.ObjectModel from 18.5.1 to 18.6.0

---
updated-dependencies:
- dependency-name: Microsoft.TestPlatform.ObjectModel
  dependency-version: 18.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.8" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.7" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
-    <PackageVersion Include="Microsoft.TestPlatform.ObjectModel" Version="18.5.1" />
+    <PackageVersion Include="Microsoft.TestPlatform.ObjectModel" Version="18.6.0" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Nito.AsyncEx" Version="5.1.2" />
     <PackageVersion Include="Nito.AsyncEx.Coordination" Version="5.1.2" />