Update dependency Microsoft.NET.Test.Sdk to 18.4.0

Author: renovate[bot]

NRayUI.Tests/NRayUI.Tests.fsproj

@@ -14,7 +14,7 @@
 
     <ItemGroup>
         <PackageReference Include="coverlet.collector" Version="8.0.1"/>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0"/>
         <PackageReference Include="xunit" Version="2.9.3"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5"/>
     </ItemGroup>