Bump 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
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Bogus" Version="35.6.5" />
     <PackageVersion Include="coverlet.collector" Version="8.0.1" />
     <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.3" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageVersion Include="MinVer" Version="7.0.0" />
     <PackageVersion Include="Scalar.AspNetCore" Version="2.13.20" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.1.7" />