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]

eFormAPI/Plugins/Workflow.Pn/Workflow.Pn.Test/Workflow.Pn.Test.csproj

@@ -15,7 +15,7 @@
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageReference Include="Testcontainers" Version="4.11.0" />
     <PackageReference Include="Testcontainers.Mariadb" Version="4.11.0" />
   </ItemGroup>