Bump the nuget group with 1 update

Bumps Microsoft.NET.Test.Sdk from 18.3.0 to 18.4.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: nuget
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Tests/Questy.Tests/Questy.Tests.csproj

@@ -14,7 +14,7 @@
   <ItemGroup>
     <PackageReference Include="Lamar" Version="15.0.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageReference Include="Shouldly" Version="4.3.0" />
     <PackageReference Include="System.Reflection.TypeExtensions" Version="4.7.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.5" />