Bump the dotnet 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: dotnet
...

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Author: dependabot[bot]

samples/snippets/core/testing/unit-testing-vb-nunit/vb/PrimeService.Tests/PrimeService.Tests.vbproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="nunit" Version="4.5.1" />
     <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" />
   </ItemGroup>
   <!--</snippetPackages>-->