chore(deps): update dependency microsoft.net.test.sdk to 18.6.0 (#764)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -38,7 +38,7 @@
     <PackageVersion Include="GitHubActionsTestLogger" Version="3.0.4" />
     <PackageVersion Include="Microsoft.Extensions.Diagnostics.Testing" Version="10.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="$(MicrosoftExtensionsVersion)" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="OpenTelemetry" Version="1.15.3" />
     <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="1.15.3" />