chore(deps): update dependency microsoft.net.test.sdk to v18 (#281)

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

Directory.Packages.props

@@ -5,7 +5,7 @@
   <ItemGroup>
     <PackageVersion Include="Dns.Net" Version="0.2.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.9" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageVersion Include="ModernWpfUI" Version="0.9.6" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.3.1" />