Update dependency Microsoft.NET.Test.Sdk to 18.4.0

Author: renovate[bot]

src/UnitTests/UnitTests.csproj

@@ -23,7 +23,7 @@
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="7.2.2" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <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>