Bump Microsoft.NET.Test.Sdk from 18.3.0 to 18.4.0 (#10)

Author: github-actions[bot]

Directory.Packages.props

@@ -10,7 +10,7 @@
         <PackageVersion Include="NSwag.AspNetCore" Version="14.6.3"/>
     </ItemGroup>
     <ItemGroup Label="Test">
-        <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0"/>
+        <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0"/>
         <PackageVersion Include="NSubstitute" Version="5.3.0"/>
         <PackageVersion Include="Testcontainers.MongoDb" Version="4.11.0"/>
         <PackageVersion Include="xunit.v3" Version="3.2.2"/>