chore(deps): update dependency microsoft.net.test.sdk to 18.8.0 (#1795)

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

Author: renovate[bot]

Directory.Packages.props

@@ -38,7 +38,7 @@
     <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="10.0.9" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.9" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="FluentAssertions" Version="8.10.0" />