Update dependency Microsoft.NET.Test.Sdk to 18.6.0 (#627)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

src/Tests/Tests.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="3.0.4" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.6.0" />
     <PackageReference Include="NUnit" Version="4.6.1" />
     <PackageReference Include="NUnit.Analyzers" Version="4.13.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />